990352221 has 32 divisors (see below), whose sum is σ = 1436295168. Its totient is φ = 604558080.

The previous prime is 990352183. The next prime is 990352247. The reversal of 990352221 is 122253099.

It is not a de Polignac number, because 990352221 - 2⁶ = 990352157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990352261) 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 31 ways as a sum of consecutive naturals, for example, 672516 + ... + 673986.

It is an arithmetic number, because the mean of its divisors is an integer number (44884224).

Almost surely, 2^990352221 is an apocalyptic number.

It is an amenable number.

990352221 is a deficient number, since it is larger than the sum of its proper divisors (445942947).

990352221 is a wasteful number, since it uses less digits than its factorization.

990352221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 990352221 is about 31469.8621064662. The cubic root of 990352221 is about 996.7736756926.

The spelling of 990352221 in words is "nine hundred ninety million, three hundred fifty-two thousand, two hundred twenty-one".