1256269523 has 2 divisors, whose sum is σ = 1256269524. Its totient is φ = 1256269522.

The previous prime is 1256269501. The next prime is 1256269549. The reversal of 1256269523 is 3259626521.

It is a weak prime.

It is an emirp because it is prime and its reverse (3259626521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256269523 - 2⁶ = 1256269459 is a prime.

It is a super-2 number, since 2×1256269523² = 3156426228837295058, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1256269423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628134761 + 628134762.

It is an arithmetic number, because the mean of its divisors is an integer number (628134762).

Almost surely, 2^1256269523 is an apocalyptic number.

1256269523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256269523 is an equidigital number, since it uses as much as digits as its factorization.

1256269523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 41.

The square root of 1256269523 is about 35443.8926050737. The cubic root of 1256269523 is about 1079.0153127634.

The spelling of 1256269523 in words is "one billion, two hundred fifty-six million, two hundred sixty-nine thousand, five hundred twenty-three".