91138027922 has 54 divisors (see below), whose sum is σ = 150750139293. Its totient is φ = 41313936384.

The previous prime is 91138027879. The next prime is 91138027927. The reversal of 91138027922 is 22972083119.

It can be written as a sum of positive squares in 14 ways, for example, as 1396442161 + 89741585761 = 37369^2 + 299569^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=213469.

It is a super-2 number, since 2×91138027922² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91138027927) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 210480218 + ... + 210480650.

Almost surely, 2^91138027922 is an apocalyptic number.

91138027922 is a deficient number, since it is larger than the sum of its proper divisors (59612111371).

91138027922 is an equidigital number, since it uses as much as digits as its factorization.

91138027922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 91138027922 in words is "ninety-one billion, one hundred thirty-eight million, twenty-seven thousand, nine hundred twenty-two".