91919091824 has 40 divisors (see below), whose sum is σ = 210553592160. Its totient is φ = 38035484928.

The previous prime is 91919091799. The next prime is 91919091877. The reversal of 91919091824 is 42819091919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14146859 + ... + 14153354.

It is an arithmetic number, because the mean of its divisors is an integer number (5263839804).

Almost surely, 2^91919091824 is an apocalyptic number.

It is an amenable number.

91919091824 is an abundant number, since it is smaller than the sum of its proper divisors (118634500336).

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

91919091824 is a wasteful number, since it uses less digits than its factorization.

91919091824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28300257 (or 28300251 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 53.

The spelling of 91919091824 in words is "ninety-one billion, nine hundred nineteen million, ninety-one thousand, eight hundred twenty-four".