91580012491 has 8 divisors (see below), whose sum is σ = 99907928064. Its totient is φ = 83252506920.

The previous prime is 91580012473. The next prime is 91580012507. The reversal of 91580012491 is 19421008519.

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

It is not a de Polignac number, because 91580012491 - 2⁹ = 91580011979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91580012411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539286 + ... + 688468.

It is an arithmetic number, because the mean of its divisors is an integer number (12488491008).

Almost surely, 2^91580012491 is an apocalyptic number.

91580012491 is a deficient number, since it is larger than the sum of its proper divisors (8327915573).

91580012491 is a wasteful number, since it uses less digits than its factorization.

91580012491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205001.

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 91580012491 in words is "ninety-one billion, five hundred eighty million, twelve thousand, four hundred ninety-one".