100990100 has 18 divisors (see below), whose sum is σ = 219148734. Its totient is φ = 40396000.

The previous prime is 100990091. The next prime is 100990133. The reversal of 100990100 is 1099001.

It can be written as a sum of positive squares in 3 ways, for example, as 749956 + 100240144 = 866^2 + 10012^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 504851 + ... + 505050.

Almost surely, 2^100990100 is an apocalyptic number.

100990100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100990100 is an abundant number, since it is smaller than the sum of its proper divisors (118158634).

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

100990100 is a wasteful number, since it uses less digits than its factorization.

100990100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009915 (or 1009908 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 100990100 is about 10049.3830656414. The cubic root of 100990100 is about 465.6857343115.

The spelling of 100990100 in words is "one hundred million, nine hundred ninety thousand, one hundred".