91004788899 has 16 divisors (see below), whose sum is σ = 134834423200. Its totient is φ = 60664228128.

The previous prime is 91004788883. The next prime is 91004788949. The reversal of 91004788899 is 99888740019.

It is a Cunningham number, because it is equal to 301670²-1.

It is not a de Polignac number, because 91004788899 - 2⁴ = 91004788883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91004788099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150837 + ... + 452505.

It is an arithmetic number, because the mean of its divisors is an integer number (8427151450).

Almost surely, 2^91004788899 is an apocalyptic number.

91004788899 is a deficient number, since it is larger than the sum of its proper divisors (43829634301).

91004788899 is a wasteful number, since it uses less digits than its factorization.

91004788899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312851 (or 312845 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 91004788899 in words is "ninety-one billion, four million, seven hundred eighty-eight thousand, eight hundred ninety-nine".