86319991 has 2 divisors, whose sum is σ = 86319992. Its totient is φ = 86319990.

The previous prime is 86319929. The next prime is 86320057. The reversal of 86319991 is 19991368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86319991 - 2⁹ = 86319479 is a prime.

It is a super-2 number, since 2×86319991² = 14902281692480162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86319901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43159995 + 43159996.

It is an arithmetic number, because the mean of its divisors is an integer number (43159996).

Almost surely, 2^86319991 is an apocalyptic number.

86319991 is a deficient number, since it is larger than the sum of its proper divisors (1).

86319991 is an equidigital number, since it uses as much as digits as its factorization.

86319991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 46.

The square root of 86319991 is about 9290.8552351223. The cubic root of 86319991 is about 441.9472767317.

The spelling of 86319991 in words is "eighty-six million, three hundred nineteen thousand, nine hundred ninety-one".