86172517 has 2 divisors, whose sum is σ = 86172518. Its totient is φ = 86172516.

The previous prime is 86172503. The next prime is 86172521. The reversal of 86172517 is 71527168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81703521 + 4468996 = 9039^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 86172517 - 2⁷ = 86172389 is a prime.

It is a super-2 number, since 2×86172517² = 14851405372230578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86172577) 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, 43086258 + 43086259.

It is an arithmetic number, because the mean of its divisors is an integer number (43086259).

Almost surely, 2^86172517 is an apocalyptic number.

It is an amenable number.

86172517 is a deficient number, since it is larger than the sum of its proper divisors (1).

86172517 is an equidigital number, since it uses as much as digits as its factorization.

86172517 is an odious number, because the sum of its binary digits is odd.

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

The square root of 86172517 is about 9282.9153287100. The cubic root of 86172517 is about 441.6954506141.

The spelling of 86172517 in words is "eighty-six million, one hundred seventy-two thousand, five hundred seventeen".