91145317 has 2 divisors, whose sum is σ = 91145318. Its totient is φ = 91145316.

The previous prime is 91145311. The next prime is 91145321. The reversal of 91145317 is 71354119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78747876 + 12397441 = 8874^2 + 3521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91145317 is a prime.

It is a super-2 number, since 2×91145317² = 16614937622060978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91145311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45572658 + 45572659.

It is an arithmetic number, because the mean of its divisors is an integer number (45572659).

Almost surely, 2^91145317 is an apocalyptic number.

It is an amenable number.

91145317 is a deficient number, since it is larger than the sum of its proper divisors (1).

91145317 is an equidigital number, since it uses as much as digits as its factorization.

91145317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 91145317 is about 9547.0056562254. The cubic root of 91145317 is about 450.0334411362.

The spelling of 91145317 in words is "ninety-one million, one hundred forty-five thousand, three hundred seventeen".