222218869 has 2 divisors, whose sum is σ = 222218870. Its totient is φ = 222218868.

The previous prime is 222218809. The next prime is 222218879. The reversal of 222218869 is 968812222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171950769 + 50268100 = 13113^2 + 7090^2 .

It is a cyclic number.

It is not a de Polignac number, because 222218869 - 2¹⁵ = 222186101 is a prime.

It is a super-2 number, since 2×222218869² = 98762451479278322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222218809) 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 as a sum of consecutive naturals, namely, 111109434 + 111109435.

It is an arithmetic number, because the mean of its divisors is an integer number (111109435).

Almost surely, 2^222218869 is an apocalyptic number.

It is an amenable number.

222218869 is a deficient number, since it is larger than the sum of its proper divisors (1).

222218869 is an equidigital number, since it uses as much as digits as its factorization.

222218869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 222218869 is about 14907.0073790818. The cubic root of 222218869 is about 605.7038176575.

The spelling of 222218869 in words is "two hundred twenty-two million, two hundred eighteen thousand, eight hundred sixty-nine".