99100 has 18 divisors (see below), whose sum is σ = 215264. Its totient is φ = 39600.

The previous prime is 99089. The next prime is 99103. The reversal of 99100 is 199.

It is a nialpdrome in base 10.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 396 + ... + 595.

2⁹⁹¹⁰⁰ is an apocalyptic number.

It is an amenable number.

99100 is an abundant number, since it is smaller than the sum of its proper divisors (116164).

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

99100 is a wasteful number, since it uses less digits than its factorization.

99100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005 (or 998 counting only the distinct ones).

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

The square root of 99100 is about 314.8015247739. The cubic root of 99100 is about 46.2762208268.

Adding to 99100 its reverse (199), we get a palindrome (99299).

The spelling of 99100 in words is "ninety-nine thousand, one hundred".