331642979 has 2 divisors, whose sum is σ = 331642980. Its totient is φ = 331642978.

The previous prime is 331642931. The next prime is 331642981. The reversal of 331642979 is 979246133.

It is a strong prime.

It is an emirp because it is prime and its reverse (979246133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331642979 - 2²⁸ = 63207523 is a prime.

Together with 331642981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331642679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165821489 + 165821490.

It is an arithmetic number, because the mean of its divisors is an integer number (165821490).

Almost surely, 2^331642979 is an apocalyptic number.

331642979 is a deficient number, since it is larger than the sum of its proper divisors (1).

331642979 is an equidigital number, since it uses as much as digits as its factorization.

331642979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 331642979 is about 18211.0674865588. The cubic root of 331642979 is about 692.1872613760.

The spelling of 331642979 in words is "three hundred thirty-one million, six hundred forty-two thousand, nine hundred seventy-nine".