91800441900 has 108 divisors (see below), whose sum is σ = 291685284072. Its totient is φ = 24144756480.

The previous prime is 91800441893. The next prime is 91800441907. The reversal of 91800441900 is 914400819.

It is an interprime number because it is at equal distance from previous prime (91800441893) and next prime (91800441907).

It is a super-2 number, since 2×91800441900² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (91800441907) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 632934 + ... + 764333.

Almost surely, 2^91800441900 is an apocalyptic number.

91800441900 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91800441900 is an abundant number, since it is smaller than the sum of its proper divisors (199884842172).

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

91800441900 is a wasteful number, since it uses less digits than its factorization.

91800441900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397360 (or 1397350 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 91800441900 in words is "ninety-one billion, eight hundred million, four hundred forty-one thousand, nine hundred".