64229531 has 4 divisors (see below), whose sum is σ = 64249752. Its totient is φ = 64209312.

The previous prime is 64229507. The next prime is 64229533. The reversal of 64229531 is 13592246.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64229531 is a prime.

It is a super-2 number, since 2×64229531² = 8250865304959922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64229533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4190 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (16062438).

Almost surely, 2^64229531 is an apocalyptic number.

64229531 is a deficient number, since it is larger than the sum of its proper divisors (20221).

64229531 is a wasteful number, since it uses less digits than its factorization.

64229531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20220.

The product of its digits is 12960, while the sum is 32.

The square root of 64229531 is about 8014.3328480916. The cubic root of 64229531 is about 400.4776190564.

The spelling of 64229531 in words is "sixty-four million, two hundred twenty-nine thousand, five hundred thirty-one".