990100100 has 36 divisors (see below), whose sum is σ = 2343839568. Its totient is φ = 360036000.

The previous prime is 990100093. The next prime is 990100117. The reversal of 990100100 is 1001099.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 448946 + ... + 451145.

Almost surely, 2^990100100 is an apocalyptic number.

It is an amenable number.

990100100 is an abundant number, since it is smaller than the sum of its proper divisors (1353739468).

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

990100100 is a wasteful number, since it uses less digits than its factorization.

990100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900116 (or 900109 counting only the distinct ones).

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

The square root of 990100100 is about 31465.8560983171. The cubic root of 990100100 is about 996.6890832620.

Adding to 990100100 its reverse (1001099), we get a palindrome (991101199).

It can be divided in two parts, 9 and 90100100, that added together give a palindrome (90100109).

The spelling of 990100100 in words is "nine hundred ninety million, one hundred thousand, one hundred".