91373617 has 2 divisors, whose sum is σ = 91373618. Its totient is φ = 91373616.

The previous prime is 91373587. The next prime is 91373671. The reversal of 91373617 is 71637319.

Together with next prime (91373671) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75881521 + 15492096 = 8711^2 + 3936^2 .

It is a cyclic number.

It is not a de Polignac number, because 91373617 - 2¹⁹ = 90849329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91376617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45686808 + 45686809.

It is an arithmetic number, because the mean of its divisors is an integer number (45686809).

Almost surely, 2^91373617 is an apocalyptic number.

It is an amenable number.

91373617 is a deficient number, since it is larger than the sum of its proper divisors (1).

91373617 is an equidigital number, since it uses as much as digits as its factorization.

91373617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 37.

The square root of 91373617 is about 9558.9548068813. The cubic root of 91373617 is about 450.4088744706.

The spelling of 91373617 in words is "ninety-one million, three hundred seventy-three thousand, six hundred seventeen".