222181 has 4 divisors (see below), whose sum is σ = 227392. Its totient is φ = 216972.

The previous prime is 222163. The next prime is 222193. The reversal of 222181 is 181222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222181 - 2⁵ = 222149 is a prime.

It is a super-2 number, since 2×222181² = 98728793522, which contains 22 as substring.

It is a Duffinian number.

222181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2541 + ... + 2626.

It is an arithmetic number, because the mean of its divisors is an integer number (56848).

2²²²¹⁸¹ is an apocalyptic number.

It is an amenable number.

222181 is a deficient number, since it is larger than the sum of its proper divisors (5211).

222181 is an equidigital number, since it uses as much as digits as its factorization.

222181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5210.

The product of its digits is 64, while the sum is 16.

The square root of 222181 is about 471.3607959939. The cubic root of 222181 is about 60.5669409087.

The spelling of 222181 in words is "two hundred twenty-two thousand, one hundred eighty-one".