86172571 has 2 divisors, whose sum is σ = 86172572. Its totient is φ = 86172570.

The previous prime is 86172553. The next prime is 86172577. The reversal of 86172571 is 17527168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86172571 - 2⁵ = 86172539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86172571.

It is not a weakly prime, because it can be changed into another prime (86172577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43086285 + 43086286.

It is an arithmetic number, because the mean of its divisors is an integer number (43086286).

Almost surely, 2^86172571 is an apocalyptic number.

86172571 is a deficient number, since it is larger than the sum of its proper divisors (1).

86172571 is an equidigital number, since it uses as much as digits as its factorization.

86172571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 37.

The square root of 86172571 is about 9282.9182372786. The cubic root of 86172571 is about 441.6955428769.

The spelling of 86172571 in words is "eighty-six million, one hundred seventy-two thousand, five hundred seventy-one".