990121245 has 16 divisors (see below), whose sum is σ = 1635297792. Its totient is φ = 511030080.

The previous prime is 990121211. The next prime is 990121247. The reversal of 990121245 is 542121099.

It is not a de Polignac number, because 990121245 - 2¹¹ = 990119197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990121247) 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, 1064182 + ... + 1065111.

It is an arithmetic number, because the mean of its divisors is an integer number (102206112).

Almost surely, 2^990121245 is an apocalyptic number.

It is an amenable number.

990121245 is a deficient number, since it is larger than the sum of its proper divisors (645176547).

990121245 is a wasteful number, since it uses less digits than its factorization.

990121245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129332.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 990121245 is about 31466.1920956445. The cubic root of 990121245 is about 996.6961784505.

The spelling of 990121245 in words is "nine hundred ninety million, one hundred twenty-one thousand, two hundred forty-five".