9900131 has 4 divisors (see below), whose sum is σ = 9961032. Its totient is φ = 9839232.

The previous prime is 9900119. The next prime is 9900139. The reversal of 9900131 is 1310099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9900131 - 2¹⁸ = 9637987 is a prime.

It is a super-2 number, since 2×9900131² = 196025187634322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9900097 and 9900106.

It is not an unprimeable number, because it can be changed into a prime (9900139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30206 + ... + 30531.

It is an arithmetic number, because the mean of its divisors is an integer number (2490258).

Almost surely, 2^9900131 is an apocalyptic number.

9900131 is a deficient number, since it is larger than the sum of its proper divisors (60901).

9900131 is a wasteful number, since it uses less digits than its factorization.

9900131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60900.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 9900131 is about 3146.4473617081. The cubic root of 9900131 is about 214.7238639921.

The spelling of 9900131 in words is "nine million, nine hundred thousand, one hundred thirty-one".