86321531 has 2 divisors, whose sum is σ = 86321532. Its totient is φ = 86321530.

The previous prime is 86321513. The next prime is 86321567. The reversal of 86321531 is 13512368.

Together with previous prime (86321513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86321531 - 2¹⁸ = 86059387 is a prime.

It is a super-2 number, since 2×86321531² = 14902813428367922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 86321494 and 86321503.

It is not a weakly prime, because it can be changed into another prime (86321591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43160765 + 43160766.

It is an arithmetic number, because the mean of its divisors is an integer number (43160766).

Almost surely, 2^86321531 is an apocalyptic number.

86321531 is a deficient number, since it is larger than the sum of its proper divisors (1).

86321531 is an equidigital number, since it uses as much as digits as its factorization.

86321531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 86321531 is about 9290.9381119454. The cubic root of 86321531 is about 441.9499049168.

Adding to 86321531 its reverse (13512368), we get a palindrome (99833899).

The spelling of 86321531 in words is "eighty-six million, three hundred twenty-one thousand, five hundred thirty-one".