25256431 has 2 divisors, whose sum is σ = 25256432. Its totient is φ = 25256430.

The previous prime is 25256383. The next prime is 25256447. The reversal of 25256431 is 13465252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25256431 is a prime.

It is a super-2 number, since 2×25256431² = 1275774613715522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25256431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25256131) 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, 12628215 + 12628216.

It is an arithmetic number, because the mean of its divisors is an integer number (12628216).

Almost surely, 2^25256431 is an apocalyptic number.

25256431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25256431 is an equidigital number, since it uses as much as digits as its factorization.

25256431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 28.

The square root of 25256431 is about 5025.5776782376. The cubic root of 25256431 is about 293.3981200161.

The spelling of 25256431 in words is "twenty-five million, two hundred fifty-six thousand, four hundred thirty-one".