91457917 has 2 divisors, whose sum is σ = 91457918. Its totient is φ = 91457916.

The previous prime is 91457897. The next prime is 91457957. The reversal of 91457917 is 71975419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60388441 + 31069476 = 7771^2 + 5574^2 .

It is a cyclic number.

It is not a de Polignac number, because 91457917 - 2⁷ = 91457789 is a prime.

It is equal to p_5296669 and since 91457917 and 5296669 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91457957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45728958 + 45728959.

It is an arithmetic number, because the mean of its divisors is an integer number (45728959).

Almost surely, 2^91457917 is an apocalyptic number.

It is an amenable number.

91457917 is a deficient number, since it is larger than the sum of its proper divisors (1).

91457917 is an equidigital number, since it uses as much as digits as its factorization.

91457917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 43.

The square root of 91457917 is about 9563.3632682232. The cubic root of 91457917 is about 450.5473455036.

The spelling of 91457917 in words is "ninety-one million, four hundred fifty-seven thousand, nine hundred seventeen".