91655491 has 2 divisors, whose sum is σ = 91655492. Its totient is φ = 91655490.

The previous prime is 91655471. The next prime is 91655503. The reversal of 91655491 is 19455619.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91655491 is a prime.

It is not a weakly prime, because it can be changed into another prime (91655471) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45827745 + 45827746.

It is an arithmetic number, because the mean of its divisors is an integer number (45827746).

Almost surely, 2^91655491 is an apocalyptic number.

91655491 is a deficient number, since it is larger than the sum of its proper divisors (1).

91655491 is an equidigital number, since it uses as much as digits as its factorization.

91655491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 40.

The square root of 91655491 is about 9573.6874296167. The cubic root of 91655491 is about 450.8715471367.

The spelling of 91655491 in words is "ninety-one million, six hundred fifty-five thousand, four hundred ninety-one".