91399385227 has 4 divisors (see below), whose sum is σ = 91763526456. Its totient is φ = 91035244000.

The previous prime is 91399385213. The next prime is 91399385251. The reversal of 91399385227 is 72258399319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72258399319 = 251 ⋅287882069.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91399385227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91399785227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182070238 + ... + 182070739.

It is an arithmetic number, because the mean of its divisors is an integer number (22940881614).

Almost surely, 2^91399385227 is an apocalyptic number.

91399385227 is a deficient number, since it is larger than the sum of its proper divisors (364141229).

91399385227 is a wasteful number, since it uses less digits than its factorization.

91399385227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364141228.

The product of its digits is 7348320, while the sum is 58.

The spelling of 91399385227 in words is "ninety-one billion, three hundred ninety-nine million, three hundred eighty-five thousand, two hundred twenty-seven".