84564257531 has 4 divisors (see below), whose sum is σ = 91069200432. Its totient is φ = 78059314632.

The previous prime is 84564257507. The next prime is 84564257567. The reversal of 84564257531 is 13575246548.

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

It is a de Polignac number, because none of the positive numbers 2^k-84564257531 is a prime.

It is a super-2 number, since 2×84564257531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84564257531.

It is not an unprimeable number, because it can be changed into a prime (84564257731) 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, 3252471431 + ... + 3252471456.

It is an arithmetic number, because the mean of its divisors is an integer number (22767300108).

Almost surely, 2^84564257531 is an apocalyptic number.

84564257531 is a deficient number, since it is larger than the sum of its proper divisors (6504942901).

84564257531 is a wasteful number, since it uses less digits than its factorization.

84564257531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6504942900.

The product of its digits is 4032000, while the sum is 50.

The spelling of 84564257531 in words is "eighty-four billion, five hundred sixty-four million, two hundred fifty-seven thousand, five hundred thirty-one".