86631191 has 2 divisors, whose sum is σ = 86631192. Its totient is φ = 86631190.

The previous prime is 86631161. The next prime is 86631211. The reversal of 86631191 is 19113668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86631191 - 2¹⁴ = 86614807 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 (86631121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43315595 + 43315596.

It is an arithmetic number, because the mean of its divisors is an integer number (43315596).

Almost surely, 2^86631191 is an apocalyptic number.

86631191 is a deficient number, since it is larger than the sum of its proper divisors (1).

86631191 is an equidigital number, since it uses as much as digits as its factorization.

86631191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 86631191 is about 9307.5878185489. The cubic root of 86631191 is about 442.4777411213.

The spelling of 86631191 in words is "eighty-six million, six hundred thirty-one thousand, one hundred ninety-one".