25705931 has 2 divisors, whose sum is σ = 25705932. Its totient is φ = 25705930.

The previous prime is 25705903. The next prime is 25705951. The reversal of 25705931 is 13950752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25705931 - 2²² = 21511627 is a prime.

It is a super-2 number, since 2×25705931² = 1321589777153522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25705951) 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, 12852965 + 12852966.

It is an arithmetic number, because the mean of its divisors is an integer number (12852966).

Almost surely, 2^25705931 is an apocalyptic number.

25705931 is a deficient number, since it is larger than the sum of its proper divisors (1).

25705931 is an equidigital number, since it uses as much as digits as its factorization.

25705931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 25705931 is about 5070.1016755091. The cubic root of 25705931 is about 295.1284741565.

The spelling of 25705931 in words is "twenty-five million, seven hundred five thousand, nine hundred thirty-one".