999421013 has 4 divisors (see below), whose sum is σ = 1002252588. Its totient is φ = 996589440.

The previous prime is 999420979. The next prime is 999421057. The reversal of 999421013 is 310124999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 550277764 + 449143249 = 23458^2 + 21193^2 .

It is a cyclic number.

It is not a de Polignac number, because 999421013 - 2²² = 995226709 is a prime.

It is a super-2 number, since 2×999421013² = 1997684722451892338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999420013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415258 + ... + 1415963.

It is an arithmetic number, because the mean of its divisors is an integer number (250563147).

Almost surely, 2^999421013 is an apocalyptic number.

It is an amenable number.

999421013 is a deficient number, since it is larger than the sum of its proper divisors (2831575).

999421013 is a wasteful number, since it uses less digits than its factorization.

999421013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831574.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 999421013 is about 31613.6206879250. The cubic root of 999421013 is about 999.8069670740.

The spelling of 999421013 in words is "nine hundred ninety-nine million, four hundred twenty-one thousand, thirteen".