1253640931 has 2 divisors, whose sum is σ = 1253640932. Its totient is φ = 1253640930.

The previous prime is 1253640929. The next prime is 1253640989. The reversal of 1253640931 is 1390463521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1253640931 - 2¹ = 1253640929 is a prime.

It is a super-2 number, since 2×1253640931² = 3143231167757093522, which contains 22 as substring.

Together with 1253640929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1253640131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626820465 + 626820466.

It is an arithmetic number, because the mean of its divisors is an integer number (626820466).

Almost surely, 2^1253640931 is an apocalyptic number.

1253640931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253640931 is an equidigital number, since it uses as much as digits as its factorization.

1253640931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 1253640931 is about 35406.7921591324. The cubic root of 1253640931 is about 1078.2622175960.

The spelling of 1253640931 in words is "one billion, two hundred fifty-three million, six hundred forty thousand, nine hundred thirty-one".