990350321 has 4 divisors (see below), whose sum is σ = 991498752. Its totient is φ = 989201892.

The previous prime is 990350297. The next prime is 990350327. The reversal of 990350321 is 123053099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990350321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990350327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 572921 + ... + 574646.

It is an arithmetic number, because the mean of its divisors is an integer number (247874688).

Almost surely, 2^990350321 is an apocalyptic number.

It is an amenable number.

990350321 is a deficient number, since it is larger than the sum of its proper divisors (1148431).

990350321 is a wasteful number, since it uses less digits than its factorization.

990350321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148430.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 990350321 is about 31469.8319188394. The cubic root of 990350321 is about 996.7730382523.

The spelling of 990350321 in words is "nine hundred ninety million, three hundred fifty thousand, three hundred twenty-one".