91245879221 has 8 divisors (see below), whose sum is σ = 104283942144. Its totient is φ = 78208550640.

The previous prime is 91245879187. The next prime is 91245879227. The reversal of 91245879221 is 12297854219.

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 91245879221 - 2²⁶ = 91178770357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91245879221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91245879227) 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, 115076 + ... + 442418.

It is an arithmetic number, because the mean of its divisors is an integer number (13035492768).

Almost surely, 2^91245879221 is an apocalyptic number.

It is an amenable number.

91245879221 is a deficient number, since it is larger than the sum of its proper divisors (13038062923).

91245879221 is a wasteful number, since it uses less digits than its factorization.

91245879221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367171.

The product of its digits is 725760, while the sum is 50.

The spelling of 91245879221 in words is "ninety-one billion, two hundred forty-five million, eight hundred seventy-nine thousand, two hundred twenty-one".