990200121 has 4 divisors (see below), whose sum is σ = 1320266832. Its totient is φ = 660133412.

The previous prime is 990200119. The next prime is 990200161. The reversal of 990200121 is 121002099.

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 not a de Polignac number, because 990200121 - 2¹ = 990200119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 990200091 and 990200100.

It is not an unprimeable number, because it can be changed into a prime (990200161) 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 3 ways as a sum of consecutive naturals, for example, 165033351 + ... + 165033356.

It is an arithmetic number, because the mean of its divisors is an integer number (330066708).

Almost surely, 2^990200121 is an apocalyptic number.

It is an amenable number.

990200121 is a deficient number, since it is larger than the sum of its proper divisors (330066711).

990200121 is a wasteful number, since it uses less digits than its factorization.

990200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330066710.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 990200121 is about 31467.4454158580. The cubic root of 990200121 is about 996.7226443406.

The spelling of 990200121 in words is "nine hundred ninety million, two hundred thousand, one hundred twenty-one".