64438131 has 4 divisors (see below), whose sum is σ = 85917512. Its totient is φ = 42958752.

The previous prime is 64438103. The next prime is 64438141. The reversal of 64438131 is 13183446.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64438131 - 2⁹ = 64437619 is a prime.

It is a super-2 number, since 2×64438131² = 8304545453546322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64438141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10739686 + ... + 10739691.

It is an arithmetic number, because the mean of its divisors is an integer number (21479378).

Almost surely, 2^64438131 is an apocalyptic number.

64438131 is a deficient number, since it is larger than the sum of its proper divisors (21479381).

64438131 is a wasteful number, since it uses less digits than its factorization.

64438131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21479380.

The product of its digits is 6912, while the sum is 30.

The square root of 64438131 is about 8027.3364822960. The cubic root of 64438131 is about 400.9106979164.

The spelling of 64438131 in words is "sixty-four million, four hundred thirty-eight thousand, one hundred thirty-one".