122218999 has 4 divisors (see below), whose sum is σ = 139678864. Its totient is φ = 104759136.

The previous prime is 122218973. The next prime is 122219003. The reversal of 122218999 is 999812221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999812221 = 43 ⋅23251447.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122218999 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 (122218919) 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, 8729922 + ... + 8729935.

It is an arithmetic number, because the mean of its divisors is an integer number (34919716).

Almost surely, 2^122218999 is an apocalyptic number.

122218999 is a deficient number, since it is larger than the sum of its proper divisors (17459865).

122218999 is an equidigital number, since it uses as much as digits as its factorization.

122218999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17459864.

The product of its digits is 46656, while the sum is 43.

The square root of 122218999 is about 11055.2701911803. The cubic root of 122218999 is about 496.2641551119.

The spelling of 122218999 in words is "one hundred twenty-two million, two hundred eighteen thousand, nine hundred ninety-nine".