91000031032 has 32 divisors (see below), whose sum is σ = 180424944000. Its totient is φ = 42958310400.

The previous prime is 91000031027. The next prime is 91000031039. The reversal of 91000031032 is 23013000019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000031039) 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, 4464657 + ... + 4484992.

It is an arithmetic number, because the mean of its divisors is an integer number (5638279500).

Almost surely, 2^91000031032 is an apocalyptic number.

It is an amenable number.

91000031032 is a deficient number, since it is larger than the sum of its proper divisors (89424912968).

91000031032 is a wasteful number, since it uses less digits than its factorization.

91000031032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8949727 (or 8949723 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

The spelling of 91000031032 in words is "ninety-one billion, thirty-one thousand, thirty-two".