91044987444 has 48 divisors (see below), whose sum is σ = 236068472640. Its totient is φ = 30344997600.

The previous prime is 91044987401. The next prime is 91044987461. The reversal of 91044987444 is 44478944019.

It is a happy number.

91044987444 is a `hidden beast` number, since 9 + 104 + 4 + 98 + 7 + 444 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1065094 + ... + 1147394.

It is an arithmetic number, because the mean of its divisors is an integer number (4918093180).

Almost surely, 2^91044987444 is an apocalyptic number.

It is an amenable number.

91044987444 is an abundant number, since it is smaller than the sum of its proper divisors (145023485196).

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

91044987444 is a wasteful number, since it uses less digits than its factorization.

91044987444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92557 (or 92549 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 91044987444 in words is "ninety-one billion, forty-four million, nine hundred eighty-seven thousand, four hundred forty-four".