990201 has 4 divisors (see below), whose sum is σ = 1320272. Its totient is φ = 660132.

The previous prime is 990181. The next prime is 990211. The reversal of 990201 is 102099.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 102099 = 3 ⋅34033.

It is not a de Polignac number, because 990201 - 2⁵ = 990169 is a prime.

It is a D-number.

It is a Duffinian number.

990201 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (990211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165031 + ... + 165036.

It is an arithmetic number, because the mean of its divisors is an integer number (330068).

2⁹⁹⁰²⁰¹ is an apocalyptic number.

It is an amenable number.

990201 is a deficient number, since it is larger than the sum of its proper divisors (330071).

990201 is a wasteful number, since it uses less digits than its factorization.

990201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330070.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 990201 is about 995.0884382807. The cubic root of 990201 is about 99.6722939271.

The spelling of 990201 in words is "nine hundred ninety thousand, two hundred one".