864320876531 has 32 divisors (see below), whose sum is σ = 1054212096000. Its totient is φ = 692137304352.

The previous prime is 864320876519. The next prime is 864320876579. The reversal of 864320876531 is 135678023468.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 864320876531 - 2¹⁴ = 864320860147 is a prime.

It is a super-2 number, since 2×864320876531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (864320876231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8766350 + ... + 8864396.

It is an arithmetic number, because the mean of its divisors is an integer number (32944128000).

Almost surely, 2^864320876531 is an apocalyptic number.

864320876531 is a deficient number, since it is larger than the sum of its proper divisors (189891219469).

864320876531 is a wasteful number, since it uses less digits than its factorization.

864320876531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98991.

The product of its (nonzero) digits is 5806080, while the sum is 53.

Adding to 864320876531 its reverse (135678023468), we get a palindrome (999998899999).

The spelling of 864320876531 in words is "eight hundred sixty-four billion, three hundred twenty million, eight hundred seventy-six thousand, five hundred thirty-one".