990168809 has 8 divisors (see below), whose sum is σ = 1133241408. Its totient is φ = 847501200.

The previous prime is 990168797. The next prime is 990168821. The reversal of 990168809 is 908861099.

990168809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (990168797) and next prime (990168821).

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

It is not a de Polignac number, because 990168809 - 2¹² = 990164713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990168889) 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, 95987 + ... + 105800.

It is an arithmetic number, because the mean of its divisors is an integer number (141655176).

Almost surely, 2^990168809 is an apocalyptic number.

It is an amenable number.

990168809 is a deficient number, since it is larger than the sum of its proper divisors (143072599).

990168809 is a wasteful number, since it uses less digits than its factorization.

990168809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202495.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 990168809 is about 31466.9478818649. The cubic root of 990168809 is about 996.7121381451.

The spelling of 990168809 in words is "nine hundred ninety million, one hundred sixty-eight thousand, eight hundred nine".