91013231032 has 8 divisors (see below), whose sum is σ = 170649808200. Its totient is φ = 45506615512.

The previous prime is 91013230993. The next prime is 91013231117. The reversal of 91013231032 is 23013231019.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 91013230988 and 91013231006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5688326932 + ... + 5688326947.

It is an arithmetic number, because the mean of its divisors is an integer number (21331226025).

Almost surely, 2^91013231032 is an apocalyptic number.

It is an amenable number.

91013231032 is a deficient number, since it is larger than the sum of its proper divisors (79636577168).

91013231032 is a wasteful number, since it uses less digits than its factorization.

91013231032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11376653885 (or 11376653881 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 91013231032 in words is "ninety-one billion, thirteen million, two hundred thirty-one thousand, thirty-two".