331693889 has 2 divisors, whose sum is σ = 331693890. Its totient is φ = 331693888.

The previous prime is 331693841. The next prime is 331693931. The reversal of 331693889 is 988396133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218803264 + 112890625 = 14792^2 + 10625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331693889 is a prime.

It is a super-2 number, since 2×331693889² = 220041671999888642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331693819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165846944 + 165846945.

It is an arithmetic number, because the mean of its divisors is an integer number (165846945).

Almost surely, 2^331693889 is an apocalyptic number.

It is an amenable number.

331693889 is a deficient number, since it is larger than the sum of its proper divisors (1).

331693889 is an equidigital number, since it uses as much as digits as its factorization.

331693889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The square root of 331693889 is about 18212.4652093010. The cubic root of 331693889 is about 692.2226784286. Note that the first 3 decimals are identical.

The spelling of 331693889 in words is "three hundred thirty-one million, six hundred ninety-three thousand, eight hundred eighty-nine".