222516181 has 2 divisors, whose sum is σ = 222516182. Its totient is φ = 222516180.

The previous prime is 222516149. The next prime is 222516193. The reversal of 222516181 is 181615222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181440900 + 41075281 = 13470^2 + 6409^2 .

It is a cyclic number.

It is not a de Polignac number, because 222516181 - 2⁵ = 222516149 is a prime.

It is a super-2 number, since 2×222516181² = 99026901613649522, which contains 22 as substring.

It is a Chen prime.

It is equal to p_12253465 and since 222516181 and 12253465 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222516131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111258090 + 111258091.

It is an arithmetic number, because the mean of its divisors is an integer number (111258091).

Almost surely, 2^222516181 is an apocalyptic number.

It is an amenable number.

222516181 is a deficient number, since it is larger than the sum of its proper divisors (1).

222516181 is an equidigital number, since it uses as much as digits as its factorization.

222516181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 28.

The square root of 222516181 is about 14916.9762686679. The cubic root of 222516181 is about 605.9738258727.

The spelling of 222516181 in words is "two hundred twenty-two million, five hundred sixteen thousand, one hundred eighty-one".