91138027923 has 12 divisors (see below), whose sum is σ = 131714127480. Its totient is φ = 60726234816.

The previous prime is 91138027879. The next prime is 91138027927. The reversal of 91138027923 is 32972083119.

It is not a de Polignac number, because 91138027923 - 2¹² = 91138023827 is a prime.

It is a super-2 number, since 2×91138027923² (a number of 23 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 2686413 + ... + 2720126.

It is an arithmetic number, because the mean of its divisors is an integer number (10976177290).

Almost surely, 2^91138027923 is an apocalyptic number.

91138027923 is a deficient number, since it is larger than the sum of its proper divisors (40576099557).

91138027923 is a wasteful number, since it uses less digits than its factorization.

91138027923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5408418 (or 5408415 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 91138027923 in words is "ninety-one billion, one hundred thirty-eight million, twenty-seven thousand, nine hundred twenty-three".