86591257 has 2 divisors, whose sum is σ = 86591258. Its totient is φ = 86591256.

The previous prime is 86591209. The next prime is 86591273. The reversal of 86591257 is 75219568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83832336 + 2758921 = 9156^2 + 1661^2 .

It is a cyclic number.

It is not a de Polignac number, because 86591257 - 2¹⁹ = 86066969 is a prime.

It is not a weakly prime, because it can be changed into another prime (86591357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43295628 + 43295629.

It is an arithmetic number, because the mean of its divisors is an integer number (43295629).

Almost surely, 2^86591257 is an apocalyptic number.

It is an amenable number.

86591257 is a deficient number, since it is larger than the sum of its proper divisors (1).

86591257 is an equidigital number, since it uses as much as digits as its factorization.

86591257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 86591257 is about 9305.4423323128. The cubic root of 86591257 is about 442.4097416641.

The spelling of 86591257 in words is "eighty-six million, five hundred ninety-one thousand, two hundred fifty-seven".