86715961 has 2 divisors, whose sum is σ = 86715962. Its totient is φ = 86715960.

The previous prime is 86715883. The next prime is 86715983. The reversal of 86715961 is 16951768.

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., 77105961 + 9610000 = 8781^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 86715961 - 2¹⁷ = 86584889 is a prime.

It is not a weakly prime, because it can be changed into another prime (86715361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43357980 + 43357981.

It is an arithmetic number, because the mean of its divisors is an integer number (43357981).

Almost surely, 2^86715961 is an apocalyptic number.

It is an amenable number.

86715961 is a deficient number, since it is larger than the sum of its proper divisors (1).

86715961 is an equidigital number, since it uses as much as digits as its factorization.

86715961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 86715961 is about 9312.1405165515. The cubic root of 86715961 is about 442.6220179112.

The spelling of 86715961 in words is "eighty-six million, seven hundred fifteen thousand, nine hundred sixty-one".