86371531 has 2 divisors, whose sum is σ = 86371532. Its totient is φ = 86371530.

The previous prime is 86371517. The next prime is 86371559. The reversal of 86371531 is 13517368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86371531 - 2⁵ = 86371499 is a prime.

It is a super-2 number, since 2×86371531² = 14920082734567922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86371501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43185765 + 43185766.

It is an arithmetic number, because the mean of its divisors is an integer number (43185766).

Almost surely, 2^86371531 is an apocalyptic number.

86371531 is a deficient number, since it is larger than the sum of its proper divisors (1).

86371531 is an equidigital number, since it uses as much as digits as its factorization.

86371531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 86371531 is about 9293.6285163546. The cubic root of 86371531 is about 442.0352186265.

Adding to 86371531 its reverse (13517368), we get a palindrome (99888899).

The spelling of 86371531 in words is "eighty-six million, three hundred seventy-one thousand, five hundred thirty-one".