999013 has 4 divisors (see below), whose sum is σ = 1002240. Its totient is φ = 995788.

The previous prime is 999007. The next prime is 999023. The reversal of 999013 is 310999.

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 a de Polignac number, because none of the positive numbers 2^k-999013 is a prime.

It is a Duffinian number.

999013 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999023) 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, 1093 + ... + 1786.

It is an arithmetic number, because the mean of its divisors is an integer number (250560).

2⁹⁹⁹⁰¹³ is an apocalyptic number.

It is an amenable number.

999013 is a deficient number, since it is larger than the sum of its proper divisors (3227).

999013 is a wasteful number, since it uses less digits than its factorization.

999013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 999013 is about 999.5063781687. The cubic root of 999013 is about 99.9670891700.

The spelling of 999013 in words is "nine hundred ninety-nine thousand, thirteen".