990039131 has 4 divisors (see below), whose sum is σ = 997265832. Its totient is φ = 982812432.

The previous prime is 990039121. The next prime is 990039179. The reversal of 990039131 is 131930099.

It is a happy number.

990039131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990039131 is a prime.

It is a super-2 number, since 2×990039131² = 1960354961822470322, 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 = 990039091 and 990039100.

It is not an unprimeable number, because it can be changed into a prime (990039121) 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, 3613145 + ... + 3613418.

It is an arithmetic number, because the mean of its divisors is an integer number (249316458).

Almost surely, 2^990039131 is an apocalyptic number.

990039131 is a deficient number, since it is larger than the sum of its proper divisors (7226701).

990039131 is a wasteful number, since it uses less digits than its factorization.

990039131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7226700.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 990039131 is about 31464.8872713697. The cubic root of 990039131 is about 996.6686245952.

The spelling of 990039131 in words is "nine hundred ninety million, thirty-nine thousand, one hundred thirty-one".