990218317 has 16 divisors (see below), whose sum is σ = 1093704192. Its totient is φ = 889049520.

The previous prime is 990218297. The next prime is 990218351. The reversal of 990218317 is 713812099.

It is a cyclic number.

It is not a de Polignac number, because 990218317 - 2⁷ = 990218189 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 990218317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990218357) 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 15 ways as a sum of consecutive naturals, for example, 297778 + ... + 301084.

It is an arithmetic number, because the mean of its divisors is an integer number (68356512).

Almost surely, 2^990218317 is an apocalyptic number.

It is an amenable number.

990218317 is a deficient number, since it is larger than the sum of its proper divisors (103485875).

990218317 is a wasteful number, since it uses less digits than its factorization.

990218317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 990218317 is about 31467.7345387303. The cubic root of 990218317 is about 996.7287495894.

The spelling of 990218317 in words is "nine hundred ninety million, two hundred eighteen thousand, three hundred seventeen".