86631239 has 2 divisors, whose sum is σ = 86631240. Its totient is φ = 86631238.

The previous prime is 86631211. The next prime is 86631253. The reversal of 86631239 is 93213668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86631239 - 2⁸ = 86630983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86631299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43315619 + 43315620.

It is an arithmetic number, because the mean of its divisors is an integer number (43315620).

Almost surely, 2^86631239 is an apocalyptic number.

86631239 is a deficient number, since it is larger than the sum of its proper divisors (1).

86631239 is an equidigital number, since it uses as much as digits as its factorization.

86631239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 86631239 is about 9307.5903970899. The cubic root of 86631239 is about 442.4778228429.

The spelling of 86631239 in words is "eighty-six million, six hundred thirty-one thousand, two hundred thirty-nine".