222118643 has 2 divisors, whose sum is σ = 222118644. Its totient is φ = 222118642.

The previous prime is 222118619. The next prime is 222118681. The reversal of 222118643 is 346811222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222118643 - 2⁶ = 222118579 is a prime.

It is a super-2 number, since 2×222118643² = 98673383136322898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (222118343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111059321 + 111059322.

It is an arithmetic number, because the mean of its divisors is an integer number (111059322).

Almost surely, 2^222118643 is an apocalyptic number.

222118643 is a deficient number, since it is larger than the sum of its proper divisors (1).

222118643 is an equidigital number, since it uses as much as digits as its factorization.

222118643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 222118643 is about 14903.6452923437. The cubic root of 222118643 is about 605.6127416833.

Adding to 222118643 its reverse (346811222), we get a palindrome (568929865).

The spelling of 222118643 in words is "two hundred twenty-two million, one hundred eighteen thousand, six hundred forty-three".