86591971 has 2 divisors, whose sum is σ = 86591972. Its totient is φ = 86591970.

The previous prime is 86591963. The next prime is 86591977. The reversal of 86591971 is 17919568.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86591971 - 2³ = 86591963 is a prime.

It is not a weakly prime, because it can be changed into another prime (86591977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43295985 + 43295986.

It is an arithmetic number, because the mean of its divisors is an integer number (43295986).

Almost surely, 2^86591971 is an apocalyptic number.

86591971 is a deficient number, since it is larger than the sum of its proper divisors (1).

86591971 is an equidigital number, since it uses as much as digits as its factorization.

86591971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 86591971 is about 9305.4806968797. The cubic root of 86591971 is about 442.4109576440.

The spelling of 86591971 in words is "eighty-six million, five hundred ninety-one thousand, nine hundred seventy-one".