909085631 has 2 divisors, whose sum is σ = 909085632. Its totient is φ = 909085630.

The previous prime is 909085577. The next prime is 909085643. The reversal of 909085631 is 136580909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 909085631 - 2²² = 904891327 is a prime.

It is a super-2 number, since 2×909085631² = 1652873368981336322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (909085691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454542815 + 454542816.

It is an arithmetic number, because the mean of its divisors is an integer number (454542816).

Almost surely, 2^909085631 is an apocalyptic number.

909085631 is a deficient number, since it is larger than the sum of its proper divisors (1).

909085631 is an equidigital number, since it uses as much as digits as its factorization.

909085631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 909085631 is about 30151.0469304135. The cubic root of 909085631 is about 968.7274313660.

The spelling of 909085631 in words is "nine hundred nine million, eighty-five thousand, six hundred thirty-one".