91550917 has 2 divisors, whose sum is σ = 91550918. Its totient is φ = 91550916.

The previous prime is 91550891. The next prime is 91550929. The reversal of 91550917 is 71905519.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88623396 + 2927521 = 9414^2 + 1711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91550917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91550947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45775458 + 45775459.

It is an arithmetic number, because the mean of its divisors is an integer number (45775459).

Almost surely, 2^91550917 is an apocalyptic number.

It is an amenable number.

91550917 is a deficient number, since it is larger than the sum of its proper divisors (1).

91550917 is an equidigital number, since it uses as much as digits as its factorization.

91550917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 91550917 is about 9568.2243389252. The cubic root of 91550917 is about 450.7000084625.

The spelling of 91550917 in words is "ninety-one million, five hundred fifty thousand, nine hundred seventeen".