64131975 has 18 divisors (see below), whose sum is σ = 114867896. Its totient is φ = 34203600.

The previous prime is 64131943. The next prime is 64131983. The reversal of 64131975 is 57913146.

64131975 is a `hidden beast` number, since 641 + 3 + 1 + 9 + 7 + 5 = 666.

It is not a de Polignac number, because 64131975 - 2⁵ = 64131943 is a prime.

It is a super-2 number, since 2×64131975² = 8225820434801250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 142291 + ... + 142740.

Almost surely, 2^64131975 is an apocalyptic number.

64131975 is a deficient number, since it is larger than the sum of its proper divisors (50735921).

64131975 is a wasteful number, since it uses less digits than its factorization.

64131975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285047 (or 285039 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 64131975 is about 8008.2441895836. The cubic root of 64131975 is about 400.2747591420.

The spelling of 64131975 in words is "sixty-four million, one hundred thirty-one thousand, nine hundred seventy-five".