91655617 has 2 divisors, whose sum is σ = 91655618. Its totient is φ = 91655616.

The previous prime is 91655609. The next prime is 91655633. The reversal of 91655617 is 71655619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90801841 + 853776 = 9529^2 + 924^2 .

It is a cyclic number.

It is not a de Polignac number, because 91655617 - 2³ = 91655609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91655617.

It is not a weakly prime, because it can be changed into another prime (91605617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45827808 + 45827809.

It is an arithmetic number, because the mean of its divisors is an integer number (45827809).

Almost surely, 2^91655617 is an apocalyptic number.

It is an amenable number.

91655617 is a deficient number, since it is larger than the sum of its proper divisors (1).

91655617 is an equidigital number, since it uses as much as digits as its factorization.

91655617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 40.

The square root of 91655617 is about 9573.6940101509. The cubic root of 91655617 is about 450.8717537429.

The spelling of 91655617 in words is "ninety-one million, six hundred fifty-five thousand, six hundred seventeen".