25085831 has 2 divisors, whose sum is σ = 25085832. Its totient is φ = 25085830.

The previous prime is 25085779. The next prime is 25085861. The reversal of 25085831 is 13858052.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25085831 is a prime.

It is a super-2 number, since 2×25085831² = 1258597833921122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25085861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12542915 + 12542916.

It is an arithmetic number, because the mean of its divisors is an integer number (12542916).

Almost surely, 2^25085831 is an apocalyptic number.

25085831 is a deficient number, since it is larger than the sum of its proper divisors (1).

25085831 is an equidigital number, since it uses as much as digits as its factorization.

25085831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 25085831 is about 5008.5757456586. The cubic root of 25085831 is about 292.7360200854.

The spelling of 25085831 in words is "twenty-five million, eighty-five thousand, eight hundred thirty-one".