331979661 has 16 divisors (see below), whose sum is σ = 529654720. Its totient is φ = 204294960.

The previous prime is 331979657. The next prime is 331979717. The reversal of 331979661 is 166979133.

It is not a de Polignac number, because 331979661 - 2² = 331979657 is a prime.

It is a super-2 number, since 2×331979661² = 220420990635349842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331979161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472555 + ... + 473256.

It is an arithmetic number, because the mean of its divisors is an integer number (33103420).

Almost surely, 2^331979661 is an apocalyptic number.

It is an amenable number.

331979661 is a deficient number, since it is larger than the sum of its proper divisors (197675059).

331979661 is a wasteful number, since it uses less digits than its factorization.

331979661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945833 (or 945827 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 331979661 is about 18220.3090259194. The cubic root of 331979661 is about 692.4214169671.

The spelling of 331979661 in words is "three hundred thirty-one million, nine hundred seventy-nine thousand, six hundred sixty-one".