1253691931 has 2 divisors, whose sum is σ = 1253691932. Its totient is φ = 1253691930.

The previous prime is 1253691919. The next prime is 1253691977. The reversal of 1253691931 is 1391963521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1253691931 - 2⁵ = 1253691899 is a prime.

It is a super-2 number, since 2×1253691931² = 3143486915709017522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1253691331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626845965 + 626845966.

It is an arithmetic number, because the mean of its divisors is an integer number (626845966).

Almost surely, 2^1253691931 is an apocalyptic number.

1253691931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253691931 is an equidigital number, since it uses as much as digits as its factorization.

1253691931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 40.

The square root of 1253691931 is about 35407.5123526068. The cubic root of 1253691931 is about 1078.2768391743.

The spelling of 1253691931 in words is "one billion, two hundred fifty-three million, six hundred ninety-one thousand, nine hundred thirty-one".