990000813 has 4 divisors (see below), whose sum is σ = 1320001088. Its totient is φ = 660000540.

The previous prime is 990000793. The next prime is 990000839. The reversal of 990000813 is 318000099.

It is a happy number.

990000813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 318000099 = 3 ⋅106000033.

It is not a de Polignac number, because 990000813 - 2¹³ = 989992621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990000853) 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, 165000133 + ... + 165000138.

It is an arithmetic number, because the mean of its divisors is an integer number (330000272).

Almost surely, 2^990000813 is an apocalyptic number.

It is an amenable number.

990000813 is a deficient number, since it is larger than the sum of its proper divisors (330000275).

990000813 is a wasteful number, since it uses less digits than its factorization.

990000813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330000274.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 990000813 is about 31464.2783645200. The cubic root of 990000813 is about 996.6557662344.

The spelling of 990000813 in words is "nine hundred ninety million, eight hundred thirteen", and thus it is an aban number.