86218631 has 2 divisors, whose sum is σ = 86218632. Its totient is φ = 86218630.

The previous prime is 86218607. The next prime is 86218709. The reversal of 86218631 is 13681268.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86218631 - 2²⁶ = 19109767 is a prime.

It is a super-2 number, since 2×86218631² = 14867304663028322, 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 = 86218591 and 86218600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86218031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43109315 + 43109316.

It is an arithmetic number, because the mean of its divisors is an integer number (43109316).

Almost surely, 2^86218631 is an apocalyptic number.

86218631 is a deficient number, since it is larger than the sum of its proper divisors (1).

86218631 is an equidigital number, since it uses as much as digits as its factorization.

86218631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 86218631 is about 9285.3988067288. The cubic root of 86218631 is about 441.7742255821.

Adding to 86218631 its reverse (13681268), we get a palindrome (99899899).

The spelling of 86218631 in words is "eighty-six million, two hundred eighteen thousand, six hundred thirty-one".