91354217 has 2 divisors, whose sum is σ = 91354218. Its totient is φ = 91354216.

The previous prime is 91354213. The next prime is 91354247. The reversal of 91354217 is 71245319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75759616 + 15594601 = 8704^2 + 3949^2 .

It is an emirp because it is prime and its reverse (71245319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91354217 - 2² = 91354213 is a prime.

It is not a weakly prime, because it can be changed into another prime (91354213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45677108 + 45677109.

It is an arithmetic number, because the mean of its divisors is an integer number (45677109).

Almost surely, 2^91354217 is an apocalyptic number.

It is an amenable number.

91354217 is a deficient number, since it is larger than the sum of its proper divisors (1).

91354217 is an equidigital number, since it uses as much as digits as its factorization.

91354217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 91354217 is about 9557.9399977192. The cubic root of 91354217 is about 450.3769960104.

The spelling of 91354217 in words is "ninety-one million, three hundred fifty-four thousand, two hundred seventeen".