671798731 has 2 divisors, whose sum is σ = 671798732. Its totient is φ = 671798730.

The previous prime is 671798723. The next prime is 671798753. The reversal of 671798731 is 137897176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671798731 - 2³ = 671798723 is a prime.

It is a super-2 number, since 2×671798731² = 902627069946420722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (671798711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335899365 + 335899366.

It is an arithmetic number, because the mean of its divisors is an integer number (335899366).

Almost surely, 2^671798731 is an apocalyptic number.

671798731 is a deficient number, since it is larger than the sum of its proper divisors (1).

671798731 is an equidigital number, since it uses as much as digits as its factorization.

671798731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 49.

The square root of 671798731 is about 25919.0804427935. The cubic root of 671798731 is about 875.8163726746.

The spelling of 671798731 in words is "six hundred seventy-one million, seven hundred ninety-eight thousand, seven hundred thirty-one".