331989139 has 2 divisors, whose sum is σ = 331989140. Its totient is φ = 331989138.

The previous prime is 331989083. The next prime is 331989157. The reversal of 331989139 is 931989133.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 331989139 - 2⁹ = 331988627 is a prime.

It is a super-2 number, since 2×331989139² = 220433576827922642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331989169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165994569 + 165994570.

It is an arithmetic number, because the mean of its divisors is an integer number (165994570).

Almost surely, 2^331989139 is an apocalyptic number.

331989139 is a deficient number, since it is larger than the sum of its proper divisors (1).

331989139 is an equidigital number, since it uses as much as digits as its factorization.

331989139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 46.

The square root of 331989139 is about 18220.5691184441. The cubic root of 331989139 is about 692.4280064348.

The spelling of 331989139 in words is "three hundred thirty-one million, nine hundred eighty-nine thousand, one hundred thirty-nine".