63991017 has 12 divisors (see below), whose sum is σ = 94398720. Its totient is φ = 41752728.

The previous prime is 63991007. The next prime is 63991033. The reversal of 63991017 is 71019936.

63991017 is a `hidden beast` number, since 639 + 9 + 1 + 0 + 17 = 666.

It is not a de Polignac number, because 63991017 - 2¹⁰ = 63989993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63991007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75217 + ... + 76062.

It is an arithmetic number, because the mean of its divisors is an integer number (7866560).

Almost surely, 2^63991017 is an apocalyptic number.

It is an amenable number.

63991017 is a deficient number, since it is larger than the sum of its proper divisors (30407703).

63991017 is a wasteful number, since it uses less digits than its factorization.

63991017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151332 (or 151329 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 63991017 is about 7999.4385427979. The cubic root of 63991017 is about 399.9812845410.

The spelling of 63991017 in words is "sixty-three million, nine hundred ninety-one thousand, seventeen".