691792331 has 2 divisors, whose sum is σ = 691792332. Its totient is φ = 691792330.

The previous prime is 691792319. The next prime is 691792349. The reversal of 691792331 is 133297196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691792331 - 2²⁶ = 624683467 is a prime.

It is a super-2 number, since 2×691792331² = 957153258460827122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (691792391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345896165 + 345896166.

It is an arithmetic number, because the mean of its divisors is an integer number (345896166).

Almost surely, 2^691792331 is an apocalyptic number.

691792331 is a deficient number, since it is larger than the sum of its proper divisors (1).

691792331 is an equidigital number, since it uses as much as digits as its factorization.

691792331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 41.

The square root of 691792331 is about 26301.9453843247. The cubic root of 691792331 is about 884.4200530782.

The spelling of 691792331 in words is "six hundred ninety-one million, seven hundred ninety-two thousand, three hundred thirty-one".