222001999 has 4 divisors (see below), whose sum is σ = 222032664. Its totient is φ = 221971336.

The previous prime is 222001987. The next prime is 222002051. The reversal of 222001999 is 999100222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222001999 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 (222001099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2244 + ... + 21190.

It is an arithmetic number, because the mean of its divisors is an integer number (55508166).

Almost surely, 2^222001999 is an apocalyptic number.

222001999 is a deficient number, since it is larger than the sum of its proper divisors (30665).

222001999 is a wasteful number, since it uses less digits than its factorization.

222001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30664.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 222001999 is about 14899.7315076480. The cubic root of 222001999 is about 605.5067120695.

The spelling of 222001999 in words is "two hundred twenty-two million, one thousand, nine hundred ninety-nine".