91380917 has 2 divisors, whose sum is σ = 91380918. Its totient is φ = 91380916.

The previous prime is 91380881. The next prime is 91380941. The reversal of 91380917 is 71908319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81558961 + 9821956 = 9031^2 + 3134^2 .

It is a cyclic number.

It is not a de Polignac number, because 91380917 - 2²² = 87186613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91380017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45690458 + 45690459.

It is an arithmetic number, because the mean of its divisors is an integer number (45690459).

Almost surely, 2^91380917 is an apocalyptic number.

It is an amenable number.

91380917 is a deficient number, since it is larger than the sum of its proper divisors (1).

91380917 is an equidigital number, since it uses as much as digits as its factorization.

91380917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 91380917 is about 9559.3366401649. The cubic root of 91380917 is about 450.4208688053.

The spelling of 91380917 in words is "ninety-one million, three hundred eighty thousand, nine hundred seventeen".