91397585 has 8 divisors (see below), whose sum is σ = 112641576. Its totient is φ = 71141760.

The previous prime is 91397557. The next prime is 91397591. The reversal of 91397585 is 58579319.

It can be written as a sum of positive squares in 4 ways, for example, as 34304449 + 57093136 = 5857^2 + 7556^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91397585 - 2⁸ = 91397329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246836 + ... + 247205.

It is an arithmetic number, because the mean of its divisors is an integer number (14080197).

Almost surely, 2^91397585 is an apocalyptic number.

It is an amenable number.

91397585 is a deficient number, since it is larger than the sum of its proper divisors (21243991).

91397585 is a wasteful number, since it uses less digits than its factorization.

91397585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494083.

The product of its digits is 340200, while the sum is 47.

The square root of 91397585 is about 9560.2084182302. The cubic root of 91397585 is about 450.4482529276.

The spelling of 91397585 in words is "ninety-one million, three hundred ninety-seven thousand, five hundred eighty-five".