86591977 has 2 divisors, whose sum is σ = 86591978. Its totient is φ = 86591976.

The previous prime is 86591971. The next prime is 86592053. The reversal of 86591977 is 77919568.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56791296 + 29800681 = 7536^2 + 5459^2 .

It is a cyclic number.

It is not a de Polignac number, because 86591977 - 2¹⁹ = 86067689 is a prime.

It is not a weakly prime, because it can be changed into another prime (86591971) 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, 43295988 + 43295989.

It is an arithmetic number, because the mean of its divisors is an integer number (43295989).

Almost surely, 2^86591977 is an apocalyptic number.

It is an amenable number.

86591977 is a deficient number, since it is larger than the sum of its proper divisors (1).

86591977 is an equidigital number, since it uses as much as digits as its factorization.

86591977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 52.

The square root of 86591977 is about 9305.4810192703. The cubic root of 86591977 is about 442.4109678623.

The spelling of 86591977 in words is "eighty-six million, five hundred ninety-one thousand, nine hundred seventy-seven".