222181217 has 2 divisors, whose sum is σ = 222181218. Its totient is φ = 222181216.

The previous prime is 222181213. The next prime is 222181229. The reversal of 222181217 is 712181222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180203776 + 41977441 = 13424^2 + 6479^2 .

It is a cyclic number.

It is not a de Polignac number, because 222181217 - 2² = 222181213 is a prime.

It is equal to p_12236093 and since 222181217 and 12236093 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (222181213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111090608 + 111090609.

It is an arithmetic number, because the mean of its divisors is an integer number (111090609).

Almost surely, 2^222181217 is an apocalyptic number.

It is an amenable number.

222181217 is a deficient number, since it is larger than the sum of its proper divisors (1).

222181217 is an equidigital number, since it uses as much as digits as its factorization.

222181217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 26.

The square root of 222181217 is about 14905.7444295815. The cubic root of 222181217 is about 605.6696062688.

It can be divided in two parts, 2221 and 81217, that added together give a palindrome (83438).

The spelling of 222181217 in words is "two hundred twenty-two million, one hundred eighty-one thousand, two hundred seventeen".