91339615021 has 8 divisors (see below), whose sum is σ = 97501147200. Its totient is φ = 85313501280.

The previous prime is 91339614979. The next prime is 91339615033. The reversal of 91339615021 is 12051693319.

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 91339615021 - 2²⁵ = 91306060589 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 (91339615051) 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, 33853216 + ... + 33855913.

It is an arithmetic number, because the mean of its divisors is an integer number (12187643400).

Almost surely, 2^91339615021 is an apocalyptic number.

It is an amenable number.

91339615021 is a deficient number, since it is larger than the sum of its proper divisors (6161532179).

91339615021 is a wasteful number, since it uses less digits than its factorization.

91339615021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67709219.

The product of its (nonzero) digits is 43740, while the sum is 40.

The spelling of 91339615021 in words is "ninety-one billion, three hundred thirty-nine million, six hundred fifteen thousand, twenty-one".