25390831 has 2 divisors, whose sum is σ = 25390832. Its totient is φ = 25390830.

The previous prime is 25390819. The next prime is 25390853. The reversal of 25390831 is 13809352.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25390831 is a prime.

It is a super-2 number, since 2×25390831² = 1289388597741122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25390793 and 25390802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25390811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695415 + 12695416.

It is an arithmetic number, because the mean of its divisors is an integer number (12695416).

Almost surely, 2^25390831 is an apocalyptic number.

25390831 is a deficient number, since it is larger than the sum of its proper divisors (1).

25390831 is an equidigital number, since it uses as much as digits as its factorization.

25390831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 25390831 is about 5038.9315335694. The cubic root of 25390831 is about 293.9176308347.

The spelling of 25390831 in words is "twenty-five million, three hundred ninety thousand, eight hundred thirty-one".