990109799 has 4 divisors (see below), whose sum is σ = 1131554064. Its totient is φ = 848665536.

The previous prime is 990109789. The next prime is 990109831. The reversal of 990109799 is 997901099.

990109799 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, and also an emirpimes, since its reverse is a distinct semiprime: 997901099 = 13 ⋅76761623.

It is a cyclic number.

It is not a de Polignac number, because 990109799 - 2²⁰ = 989061223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990109799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990109709) 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, 70722122 + ... + 70722135.

It is an arithmetic number, because the mean of its divisors is an integer number (282888516).

Almost surely, 2^990109799 is an apocalyptic number.

990109799 is a deficient number, since it is larger than the sum of its proper divisors (141444265).

990109799 is a wasteful number, since it uses less digits than its factorization.

990109799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141444264.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 990109799 is about 31466.0102173758. The cubic root of 990109799 is about 996.6923377665.

The spelling of 990109799 in words is "nine hundred ninety million, one hundred nine thousand, seven hundred ninety-nine".