1251295531 has 2 divisors, whose sum is σ = 1251295532. Its totient is φ = 1251295530.

The previous prime is 1251295517. The next prime is 1251295547. The reversal of 1251295531 is 1355921521.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1355921521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251295531 - 2⁷ = 1251295403 is a prime.

It is a super-2 number, since 2×1251295531² = 3131481011801143922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1251295561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625647765 + 625647766.

It is an arithmetic number, because the mean of its divisors is an integer number (625647766).

Almost surely, 2^1251295531 is an apocalyptic number.

1251295531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251295531 is an equidigital number, since it uses as much as digits as its factorization.

1251295531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 34.

The square root of 1251295531 is about 35373.6558896589. The cubic root of 1251295531 is about 1077.5893681113.

The spelling of 1251295531 in words is "one billion, two hundred fifty-one million, two hundred ninety-five thousand, five hundred thirty-one".