990989833 has 4 divisors (see below), whose sum is σ = 1017773380. Its totient is φ = 964206288.

The previous prime is 990989807. The next prime is 990989929. The reversal of 990989833 is 338989099.

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

It can be written as a sum of positive squares in 2 ways, for example, as 830131344 + 160858489 = 28812^2 + 12683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990989833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990989533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13391718 + ... + 13391791.

It is an arithmetic number, because the mean of its divisors is an integer number (254443345).

Almost surely, 2^990989833 is an apocalyptic number.

It is an amenable number.

990989833 is a deficient number, since it is larger than the sum of its proper divisors (26783547).

990989833 is a wasteful number, since it uses less digits than its factorization.

990989833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26783546.

The product of its (nonzero) digits is 3779136, while the sum is 58.

The square root of 990989833 is about 31479.9909942808. The cubic root of 990989833 is about 996.9875452288.

The spelling of 990989833 in words is "nine hundred ninety million, nine hundred eighty-nine thousand, eight hundred thirty-three".