91585690477 has 8 divisors (see below), whose sum is σ = 92222184600. Its totient is φ = 90951253824.

The previous prime is 91585690429. The next prime is 91585690487. The reversal of 91585690477 is 77409658519.

It can be written as a sum of positive squares in 4 ways, for example, as 17959752196 + 73625938281 = 134014^2 + 271341^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 91585690477 - 2²³ = 91577301869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91585690487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424978 + ... + 603139.

It is an arithmetic number, because the mean of its divisors is an integer number (11527773075).

Almost surely, 2^91585690477 is an apocalyptic number.

It is an amenable number.

91585690477 is a deficient number, since it is larger than the sum of its proper divisors (636494123).

91585690477 is a wasteful number, since it uses less digits than its factorization.

91585690477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028735.

The product of its (nonzero) digits is 19051200, while the sum is 61.

The spelling of 91585690477 in words is "ninety-one billion, five hundred eighty-five million, six hundred ninety thousand, four hundred seventy-seven".