91584497 has 2 divisors, whose sum is σ = 91584498. Its totient is φ = 91584496.

The previous prime is 91584487. The next prime is 91584499. The reversal of 91584497 is 79448519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65869456 + 25715041 = 8116^2 + 5071^2 .

It is a cyclic number.

It is not a de Polignac number, because 91584497 - 2⁴ = 91584481 is a prime.

Together with 91584499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91584499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45792248 + 45792249.

It is an arithmetic number, because the mean of its divisors is an integer number (45792249).

Almost surely, 2^91584497 is an apocalyptic number.

It is an amenable number.

91584497 is a deficient number, since it is larger than the sum of its proper divisors (1).

91584497 is an equidigital number, since it uses as much as digits as its factorization.

91584497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 91584497 is about 9569.9789445954. The cubic root of 91584497 is about 450.7551058763.

The spelling of 91584497 in words is "ninety-one million, five hundred eighty-four thousand, four hundred ninety-seven".