331031989 has 2 divisors, whose sum is σ = 331031990. Its totient is φ = 331031988.

The previous prime is 331031963. The next prime is 331032001. The reversal of 331031989 is 989130133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324360100 + 6671889 = 18010^2 + 2583^2 .

It is a cyclic number.

It is not a de Polignac number, because 331031989 - 2⁷ = 331031861 is a prime.

It is a super-2 number, since 2×331031989² = 219164355482592242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331031929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165515994 + 165515995.

It is an arithmetic number, because the mean of its divisors is an integer number (165515995).

Almost surely, 2^331031989 is an apocalyptic number.

It is an amenable number.

331031989 is a deficient number, since it is larger than the sum of its proper divisors (1).

331031989 is an equidigital number, since it uses as much as digits as its factorization.

331031989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 331031989 is about 18194.2845146491. The cubic root of 331031989 is about 691.7619249908.

The spelling of 331031989 in words is "three hundred thirty-one million, thirty-one thousand, nine hundred eighty-nine".