990051 has 4 divisors (see below), whose sum is σ = 1320072. Its totient is φ = 660032.

The previous prime is 990043. The next prime is 990053. The reversal of 990051 is 150099.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150099 = 3 ⋅50033.

It is a cyclic number.

It is not a de Polignac number, because 990051 - 2³ = 990043 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (990053) 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, 165006 + ... + 165011.

It is an arithmetic number, because the mean of its divisors is an integer number (330018).

2⁹⁹⁰⁰⁵¹ is an apocalyptic number.

990051 is a deficient number, since it is larger than the sum of its proper divisors (330021).

990051 is a wasteful number, since it uses less digits than its factorization.

990051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330020.

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 990051 is about 995.0130652409. The cubic root of 990051 is about 99.6672607405.

The spelling of 990051 in words is "nine hundred ninety thousand, fifty-one".