9901090100 has 72 divisors (see below), whose sum is σ = 24246885600. Its totient is φ = 3476233600.

The previous prime is 9901090091. The next prime is 9901090127. The reversal of 9901090100 is 10901099.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123290 + ... + 187089.

It is an arithmetic number, because the mean of its divisors is an integer number (336762300).

Almost surely, 2^9901090100 is an apocalyptic number.

It is an amenable number.

9901090100 is an abundant number, since it is smaller than the sum of its proper divisors (14345795500).

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

9901090100 is a wasteful number, since it uses less digits than its factorization.

9901090100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310433 (or 310426 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 9901090100 is about 99504.2215184863. The cubic root of 9901090100 is about 2147.3079773897.

Adding to 9901090100 its reverse (10901099), we get a palindrome (9911991199).

It can be divided in two parts, 9 and 901090100, that added together give a palindrome (901090109).

The spelling of 9901090100 in words is "nine billion, nine hundred one million, ninety thousand, one hundred".