91872791427 has 8 divisors (see below), whose sum is σ = 122502983680. Its totient is φ = 61245563400.

The previous prime is 91872791377. The next prime is 91872791443. The reversal of 91872791427 is 72419727819.

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

It is not a de Polignac number, because 91872791427 - 2²⁸ = 91604355971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91872791027) 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, 667699 + ... + 793452.

It is an arithmetic number, because the mean of its divisors is an integer number (15312872960).

Almost surely, 2^91872791427 is an apocalyptic number.

91872791427 is a deficient number, since it is larger than the sum of its proper divisors (30630192253).

91872791427 is a wasteful number, since it uses less digits than its factorization.

91872791427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482113.

The product of its digits is 3556224, while the sum is 57.

The spelling of 91872791427 in words is "ninety-one billion, eight hundred seventy-two million, seven hundred ninety-one thousand, four hundred twenty-seven".