990291999 has 8 divisors (see below), whose sum is σ = 1320863872. Its totient is φ = 659957400.

The previous prime is 990291949. The next prime is 990292003. The reversal of 990291999 is 999192099.

990291999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 990291999 - 2¹⁶ = 990226463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990291949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49339 + ... + 66444.

It is an arithmetic number, because the mean of its divisors is an integer number (165107984).

Almost surely, 2^990291999 is an apocalyptic number.

990291999 is a deficient number, since it is larger than the sum of its proper divisors (330571873).

990291999 is a wasteful number, since it uses less digits than its factorization.

990291999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118637.

The product of its (nonzero) digits is 1062882, while the sum is 57.

The square root of 990291999 is about 31468.9052717123. The cubic root of 990291999 is about 996.7534711230.

The spelling of 990291999 in words is "nine hundred ninety million, two hundred ninety-one thousand, nine hundred ninety-nine".