This number is a prime.
When a child has lived for 1259 days, for the first time, their age in days, weeks, months and years are all prime. The child would be 179 weeks old, that is, 41 months, or 3 years. [Hartley]
The smaller prime of the smallest pair of consecutive primes, i.e., (1259, 1277), whose sum of digits is prime and equal. [Gupta]
There are exactly 1259 odd digits before the 1259th even digit of π. (1259 is the smallest prime making the previous statement true.) [Keith]
The only prime (emirp) equal to the sum of first n consecutive primes ending with 3 and smaller than a thousand, i.e., 3+13+23+...+193+223. Note that the number of terms is also emirp (n=13). [Loungrides]
The largest concatenate emirp abcd from Ramanujan's classic paper that included a list of fifty-four quaternary (ax2 + by2 + cz2 + du2) "diagonal" quadratic forms representing all integers. [Beedassy]
The smallest prime obtained by concatenating C^B and B^A, where A, B, C are three consecutive primes. [Leonardis]
1259 = 2^(2+3+5) + 235 is the only known prime of the form 2^(sum of first n primes) + concatenation of first n primes. [Sariyar]