91613227 has 2 divisors, whose sum is σ = 91613228. Its totient is φ = 91613226.

The previous prime is 91613213. The next prime is 91613237. The reversal of 91613227 is 72231619.

It is a strong prime.

It is an emirp because it is prime and its reverse (72231619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91613227 - 2⁷ = 91613099 is a prime.

It is a super-2 number, since 2×91613227² = 16785966722707058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91613237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45806613 + 45806614.

It is an arithmetic number, because the mean of its divisors is an integer number (45806614).

Almost surely, 2^91613227 is an apocalyptic number.

91613227 is a deficient number, since it is larger than the sum of its proper divisors (1).

91613227 is an equidigital number, since it uses as much as digits as its factorization.

91613227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 91613227 is about 9571.4798751290. The cubic root of 91613227 is about 450.8022348144.

The spelling of 91613227 in words is "ninety-one million, six hundred thirteen thousand, two hundred twenty-seven".