331693931 has 2 divisors, whose sum is σ = 331693932. Its totient is φ = 331693930.

The previous prime is 331693889. The next prime is 331693939. The reversal of 331693931 is 139396133.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331693931 is a prime.

It is a super-2 number, since 2×331693931² = 220041727724465522, which contains 22 as substring.

It is a Chen prime.

It is equal to p_17871707 and since 331693931 and 17871707 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (331693939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165846965 + 165846966.

It is an arithmetic number, because the mean of its divisors is an integer number (165846966).

Almost surely, 2^331693931 is an apocalyptic number.

331693931 is a deficient number, since it is larger than the sum of its proper divisors (1).

331693931 is an equidigital number, since it uses as much as digits as its factorization.

331693931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39366, while the sum is 38.

The square root of 331693931 is about 18212.4663623574. The cubic root of 331693931 is about 692.2227076456. Note that the first 3 decimals are identical.

The spelling of 331693931 in words is "three hundred thirty-one million, six hundred ninety-three thousand, nine hundred thirty-one".