91692521 has 2 divisors, whose sum is σ = 91692522. Its totient is φ = 91692520.

The previous prime is 91692511. The next prime is 91692527. The reversal of 91692521 is 12529619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73960000 + 17732521 = 8600^2 + 4211^2 .

It is an emirp because it is prime and its reverse (12529619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91692521 - 2⁶ = 91692457 is a prime.

It is not a weakly prime, because it can be changed into another prime (91692527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45846260 + 45846261.

It is an arithmetic number, because the mean of its divisors is an integer number (45846261).

Almost surely, 2^91692521 is an apocalyptic number.

It is an amenable number.

91692521 is a deficient number, since it is larger than the sum of its proper divisors (1).

91692521 is an equidigital number, since it uses as much as digits as its factorization.

91692521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 91692521 is about 9575.6211808947. The cubic root of 91692521 is about 450.9322582673.

The spelling of 91692521 in words is "ninety-one million, six hundred ninety-two thousand, five hundred twenty-one".