401239931 has 2 divisors, whose sum is σ = 401239932. Its totient is φ = 401239930.

The previous prime is 401239907. The next prime is 401239939. The reversal of 401239931 is 139932104.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401239931 is a prime.

It is a super-2 number, since 2×401239931² = 321986964457769522, 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 (401239939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200619965 + 200619966.

It is an arithmetic number, because the mean of its divisors is an integer number (200619966).

Almost surely, 2^401239931 is an apocalyptic number.

401239931 is a deficient number, since it is larger than the sum of its proper divisors (1).

401239931 is an equidigital number, since it uses as much as digits as its factorization.

401239931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 401239931 is about 20030.9742898342. The cubic root of 401239931 is about 737.5668385655.

The spelling of 401239931 in words is "four hundred one million, two hundred thirty-nine thousand, nine hundred thirty-one".