91585424649 has 16 divisors (see below), whose sum is σ = 123093679104. Its totient is φ = 60567421200.

The previous prime is 91585424629. The next prime is 91585424659. The reversal of 91585424649 is 94642458519.

It is a happy number.

It is not a de Polignac number, because 91585424649 - 2⁵ = 91585424617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91585424629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002804 + ... + 1090314.

It is an arithmetic number, because the mean of its divisors is an integer number (7693354944).

Almost surely, 2^91585424649 is an apocalyptic number.

It is an amenable number.

91585424649 is a deficient number, since it is larger than the sum of its proper divisors (31508254455).

91585424649 is a wasteful number, since it uses less digits than its factorization.

91585424649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90308.

The product of its digits is 12441600, while the sum is 57.

The spelling of 91585424649 in words is "ninety-one billion, five hundred eighty-five million, four hundred twenty-four thousand, six hundred forty-nine".