63979931 has 2 divisors, whose sum is σ = 63979932. Its totient is φ = 63979930.

The previous prime is 63979921. The next prime is 63979963. The reversal of 63979931 is 13997936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63979931 - 2¹⁴ = 63963547 is a prime.

It is a super-2 number, since 2×63979931² = 8186863141529522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63979921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31989965 + 31989966.

It is an arithmetic number, because the mean of its divisors is an integer number (31989966).

Almost surely, 2^63979931 is an apocalyptic number.

63979931 is a deficient number, since it is larger than the sum of its proper divisors (1).

63979931 is an equidigital number, since it uses as much as digits as its factorization.

63979931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 47.

The square root of 63979931 is about 7998.7455891533. The cubic root of 63979931 is about 399.9581852123.

The spelling of 63979931 in words is "sixty-three million, nine hundred seventy-nine thousand, nine hundred thirty-one".