999122213 has 8 divisors (see below), whose sum is σ = 1011060120. Its totient is φ = 987217920.

The previous prime is 999122177. The next prime is 999122263. The reversal of 999122213 is 312221999.

It can be written as a sum of positive squares in 4 ways, for example, as 207994084 + 791128129 = 14422^2 + 28127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999122213 - 2¹⁸ = 998860069 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 (999122263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54143 + ... + 70211.

It is an arithmetic number, because the mean of its divisors is an integer number (126382515).

Almost surely, 2^999122213 is an apocalyptic number.

It is an amenable number.

999122213 is a deficient number, since it is larger than the sum of its proper divisors (11937907).

999122213 is a wasteful number, since it uses less digits than its factorization.

999122213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16807.

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

The square root of 999122213 is about 31608.8945235356. The cubic root of 999122213 is about 999.7073186793.

The spelling of 999122213 in words is "nine hundred ninety-nine million, one hundred twenty-two thousand, two hundred thirteen".