331989431 has 2 divisors, whose sum is σ = 331989432. Its totient is φ = 331989430.

The previous prime is 331989409. The next prime is 331989439. The reversal of 331989431 is 134989133.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 331989431 - 2¹⁸ = 331727287 is a prime.

It is a super-2 number, since 2×331989431² = 220433964591407522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331989439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165994715 + 165994716.

It is an arithmetic number, because the mean of its divisors is an integer number (165994716).

Almost surely, 2^331989431 is an apocalyptic number.

331989431 is a deficient number, since it is larger than the sum of its proper divisors (1).

331989431 is an equidigital number, since it uses as much as digits as its factorization.

331989431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 331989431 is about 18220.5771313644. The cubic root of 331989431 is about 692.4282094424.

The spelling of 331989431 in words is "three hundred thirty-one million, nine hundred eighty-nine thousand, four hundred thirty-one".