86397581 has 2 divisors, whose sum is σ = 86397582. Its totient is φ = 86397580.

The previous prime is 86397539. The next prime is 86397599. The reversal of 86397581 is 18579368.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80102500 + 6295081 = 8950^2 + 2509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86397581 is a prime.

It is a super-2 number, since 2×86397581² = 14929084005303122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86397881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43198790 + 43198791.

It is an arithmetic number, because the mean of its divisors is an integer number (43198791).

Almost surely, 2^86397581 is an apocalyptic number.

It is an amenable number.

86397581 is a deficient number, since it is larger than the sum of its proper divisors (1).

86397581 is an equidigital number, since it uses as much as digits as its factorization.

86397581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 86397581 is about 9295.0299085049. The cubic root of 86397581 is about 442.0796540242.

The spelling of 86397581 in words is "eighty-six million, three hundred ninety-seven thousand, five hundred eighty-one".