91909290920 has 16 divisors (see below), whose sum is σ = 206795904660. Its totient is φ = 36763716352.

The previous prime is 91909290917. The next prime is 91909290929. The reversal of 91909290920 is 2909290919.

It can be written as a sum of positive squares in 2 ways, for example, as 81669065284 + 10240225636 = 285778^2 + 101194^2 .

It is not an unprimeable number, because it can be changed into a prime (91909290929) 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 3 ways as a sum of consecutive naturals, for example, 1148866097 + ... + 1148866176.

Almost surely, 2^91909290920 is an apocalyptic number.

It is an amenable number.

91909290920 is an abundant number, since it is smaller than the sum of its proper divisors (114886613740).

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

91909290920 is a wasteful number, since it uses less digits than its factorization.

91909290920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297732284 (or 2297732280 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 50.

The spelling of 91909290920 in words is "ninety-one billion, nine hundred nine million, two hundred ninety thousand, nine hundred twenty".