222222001 has 4 divisors (see below), whose sum is σ = 225266212. Its totient is φ = 219177792.

The previous prime is 222221971. The next prime is 222222029. The reversal of 222222001 is 100222222.

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 190412401 + 31809600 = 13799^2 + 5640^2 .

It is a cyclic number.

It is not a de Polignac number, because 222222001 - 2¹⁷ = 222090929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222222031) 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, 1521996 + ... + 1522141.

It is an arithmetic number, because the mean of its divisors is an integer number (56316553).

Almost surely, 2^222222001 is an apocalyptic number.

It is an amenable number.

222222001 is a deficient number, since it is larger than the sum of its proper divisors (3044211).

222222001 is an equidigital number, since it uses as much as digits as its factorization.

222222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044210.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 222222001 is about 14907.1124299778. The cubic root of 222222001 is about 605.7066632836.

Adding to 222222001 its reverse (100222222), we get a palindrome (322444223).

The spelling of 222222001 in words is "two hundred twenty-two million, two hundred twenty-two thousand, one".