331665889 has 2 divisors, whose sum is σ = 331665890. Its totient is φ = 331665888.

The previous prime is 331665877. The next prime is 331665899. The reversal of 331665889 is 988566133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235469025 + 96196864 = 15345^2 + 9808^2 .

It is a cyclic number.

It is not a de Polignac number, because 331665889 - 2⁹ = 331665377 is a prime.

It is a super-2 number, since 2×331665889² = 220004523852320642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331665899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165832944 + 165832945.

It is an arithmetic number, because the mean of its divisors is an integer number (165832945).

Almost surely, 2^331665889 is an apocalyptic number.

It is an amenable number.

331665889 is a deficient number, since it is larger than the sum of its proper divisors (1).

331665889 is an equidigital number, since it uses as much as digits as its factorization.

331665889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 49.

The square root of 331665889 is about 18211.6964887953. The cubic root of 331665889 is about 692.2031998460.

The spelling of 331665889 in words is "three hundred thirty-one million, six hundred sixty-five thousand, eight hundred eighty-nine".