91489417 has 2 divisors, whose sum is σ = 91489418. Its totient is φ = 91489416.

The previous prime is 91489381. The next prime is 91489421. The reversal of 91489417 is 71498419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91470096 + 19321 = 9564^2 + 139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91489417 is a prime.

It is not a weakly prime, because it can be changed into another prime (91489487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45744708 + 45744709.

It is an arithmetic number, because the mean of its divisors is an integer number (45744709).

Almost surely, 2^91489417 is an apocalyptic number.

It is an amenable number.

91489417 is a deficient number, since it is larger than the sum of its proper divisors (1).

91489417 is an equidigital number, since it uses as much as digits as its factorization.

91489417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 91489417 is about 9565.0100365865. The cubic root of 91489417 is about 450.5990655106.

The spelling of 91489417 in words is "ninety-one million, four hundred eighty-nine thousand, four hundred seventeen".