331404989 has 2 divisors, whose sum is σ = 331404990. Its totient is φ = 331404988.

The previous prime is 331404959. The next prime is 331405003. The reversal of 331404989 is 989404133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329604025 + 1800964 = 18155^2 + 1342^2 .

It is a cyclic number.

It is not a de Polignac number, because 331404989 - 2¹⁶ = 331339453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331404949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165702494 + 165702495.

It is an arithmetic number, because the mean of its divisors is an integer number (165702495).

Almost surely, 2^331404989 is an apocalyptic number.

It is an amenable number.

331404989 is a deficient number, since it is larger than the sum of its proper divisors (1).

331404989 is an equidigital number, since it uses as much as digits as its factorization.

331404989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 331404989 is about 18204.5321005512. The cubic root of 331404989 is about 692.0216484757.

The spelling of 331404989 in words is "three hundred thirty-one million, four hundred four thousand, nine hundred eighty-nine".