99999998100 has 54 divisors (see below), whose sum is σ = 313444441310. Its totient is φ = 26666665920.

The previous prime is 99999998099. The next prime is 99999998129. The reversal of 99999998100 is 189999999.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9733400964 + 90266597136 = 98658^2 + 300444^2 .

It is a super-2 number, since 2×99999998100² (a number of 23 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 55554655 + ... + 55556454.

Almost surely, 2^99999998100 is an apocalyptic number.

99999998100 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99999998100 is an abundant number, since it is smaller than the sum of its proper divisors (213444443210).

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

99999998100 is a wasteful number, since it uses less digits than its factorization.

99999998100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111111129 (or 111111119 counting only the distinct ones).

The product of its (nonzero) digits is 38263752, while the sum is 72.

The spelling of 99999998100 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, one hundred".