222222181 has 16 divisors (see below), whose sum is σ = 239466240. Its totient is φ = 205470720.

The previous prime is 222222149. The next prime is 222222193. The reversal of 222222181 is 181222222.

It is a cyclic number.

It is not a de Polignac number, because 222222181 - 2⁵ = 222222149 is a prime.

It is a super-2 number, since 2×222222181² = 98765395456793522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452346 + ... + 452836.

It is an arithmetic number, because the mean of its divisors is an integer number (14966640).

Almost surely, 2^222222181 is an apocalyptic number.

It is an amenable number.

222222181 is a deficient number, since it is larger than the sum of its proper divisors (17244059).

222222181 is a wasteful number, since it uses less digits than its factorization.

222222181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924.

The product of its digits is 512, while the sum is 22.

The square root of 222222181 is about 14907.1184673632. The cubic root of 222222181 is about 605.7068268245.

The spelling of 222222181 in words is "two hundred twenty-two million, two hundred twenty-two thousand, one hundred eighty-one".