990000000100 has 18 divisors (see below), whose sum is σ = 2148300000434. Its totient is φ = 396000000000.

The previous prime is 990000000089. The next prime is 990000000137. The reversal of 990000000100 is 1000000099.

It can be written as a sum of positive squares in 3 ways, for example, as 2568259684 + 987431740416 = 50678^2 + 993696^2 .

It is a junction number, because it is equal to n+sod(n) for n = 989999999996 and 990000000068.

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, 4949999901 + ... + 4950000100.

Almost surely, 2^990000000100 is an apocalyptic number.

It is an amenable number.

990000000100 is an abundant number, since it is smaller than the sum of its proper divisors (1158300000334).

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

990000000100 is a wasteful number, since it uses less digits than its factorization.

990000000100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9900000015 (or 9900000008 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 19.

Adding to 990000000100 its reverse (1000000099), we get a palindrome (991000000199).

The spelling of 990000000100 in words is "nine hundred ninety billion, one hundred", and thus it is an aban number.