999424213 has 2 divisors, whose sum is σ = 999424214. Its totient is φ = 999424212.

The previous prime is 999424211. The next prime is 999424219. The reversal of 999424213 is 312424999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679801329 + 319622884 = 26073^2 + 17878^2 .

It is a cyclic number.

It is not a de Polignac number, because 999424213 - 2¹ = 999424211 is a prime.

Together with 999424211, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 999424213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999424211) 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 as a sum of consecutive naturals, namely, 499712106 + 499712107.

It is an arithmetic number, because the mean of its divisors is an integer number (499712107).

Almost surely, 2^999424213 is an apocalyptic number.

It is an amenable number.

999424213 is a deficient number, since it is larger than the sum of its proper divisors (1).

999424213 is an equidigital number, since it uses as much as digits as its factorization.

999424213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 999424213 is about 31613.6712989808. The cubic root of 999424213 is about 999.8080341515.

The spelling of 999424213 in words is "nine hundred ninety-nine million, four hundred twenty-four thousand, two hundred thirteen".