91811901900 has 72 divisors (see below), whose sum is σ = 265672995840. Its totient is φ = 24480357440.

The previous prime is 91811901899. The next prime is 91811901913. The reversal of 91811901900 is 910911819.

It is a super-2 number, since 2×91811901900² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4684321 + ... + 4703879.

It is an arithmetic number, because the mean of its divisors is an integer number (3689902720).

Almost surely, 2^91811901900 is an apocalyptic number.

It is an amenable number.

91811901900 is an abundant number, since it is smaller than the sum of its proper divisors (173861093940).

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

91811901900 is a wasteful number, since it uses less digits than its factorization.

91811901900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35223 (or 35216 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 39.

The spelling of 91811901900 in words is "ninety-one billion, eight hundred eleven million, nine hundred one thousand, nine hundred".