671904731 has 2 divisors, whose sum is σ = 671904732. Its totient is φ = 671904730.

The previous prime is 671904721. The next prime is 671904749. The reversal of 671904731 is 137409176.

671904731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671904731 - 2²² = 667710427 is a prime.

It is a super-2 number, since 2×671904731² = 902911935080364722, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (671904721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335952365 + 335952366.

It is an arithmetic number, because the mean of its divisors is an integer number (335952366).

Almost surely, 2^671904731 is an apocalyptic number.

671904731 is a deficient number, since it is larger than the sum of its proper divisors (1).

671904731 is an equidigital number, since it uses as much as digits as its factorization.

671904731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 671904731 is about 25921.1251877691. The cubic root of 671904731 is about 875.8624339173.

The spelling of 671904731 in words is "six hundred seventy-one million, nine hundred four thousand, seven hundred thirty-one".