409625831 has 2 divisors, whose sum is σ = 409625832. Its totient is φ = 409625830.

The previous prime is 409625819. The next prime is 409625857. The reversal of 409625831 is 138526904.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409625831 - 2¹⁸ = 409363687 is a prime.

It is a super-2 number, since 2×409625831² = 335586642844881122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409625891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204812915 + 204812916.

It is an arithmetic number, because the mean of its divisors is an integer number (204812916).

Almost surely, 2^409625831 is an apocalyptic number.

409625831 is a deficient number, since it is larger than the sum of its proper divisors (1).

409625831 is an equidigital number, since it uses as much as digits as its factorization.

409625831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 409625831 is about 20239.2151774717. The cubic root of 409625831 is about 742.6698246229.

The spelling of 409625831 in words is "four hundred nine million, six hundred twenty-five thousand, eight hundred thirty-one".