91404517 has 2 divisors, whose sum is σ = 91404518. Its totient is φ = 91404516.

The previous prime is 91404503. The next prime is 91404527. The reversal of 91404517 is 71540419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87721956 + 3682561 = 9366^2 + 1919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91404517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91404527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45702258 + 45702259.

It is an arithmetic number, because the mean of its divisors is an integer number (45702259).

Almost surely, 2^91404517 is an apocalyptic number.

It is an amenable number.

91404517 is a deficient number, since it is larger than the sum of its proper divisors (1).

91404517 is an equidigital number, since it uses as much as digits as its factorization.

91404517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 91404517 is about 9560.5709557536. The cubic root of 91404517 is about 450.4596406404.

The spelling of 91404517 in words is "ninety-one million, four hundred four thousand, five hundred seventeen".