91431004044 has 24 divisors (see below), whose sum is σ = 213354908928. Its totient is φ = 30474730000.

The previous prime is 91431004043. The next prime is 91431004057. The reversal of 91431004044 is 44040013419.

It is not an unprimeable number, because it can be changed into a prime (91431004043) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 112032 + ... + 442055.

It is an arithmetic number, because the mean of its divisors is an integer number (8889787872).

Almost surely, 2^91431004044 is an apocalyptic number.

It is an amenable number.

91431004044 is an abundant number, since it is smaller than the sum of its proper divisors (121923904884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91431004044 is a wasteful number, since it uses less digits than its factorization.

91431004044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567845 (or 567843 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 91431004044 in words is "ninety-one billion, four hundred thirty-one million, four thousand, forty-four".