222774161 has 2 divisors, whose sum is σ = 222774162. Its totient is φ = 222774160.

The previous prime is 222774157. The next prime is 222774163. The reversal of 222774161 is 161477222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218596225 + 4177936 = 14785^2 + 2044^2 .

It is a cyclic number.

It is not a de Polignac number, because 222774161 - 2² = 222774157 is a prime.

It is a super-4 number, since 4×222774161⁴ (a number of 34 digits) contains 4444 as substring.

Together with 222774163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222774163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111387080 + 111387081.

It is an arithmetic number, because the mean of its divisors is an integer number (111387081).

Almost surely, 2^222774161 is an apocalyptic number.

It is an amenable number.

222774161 is a deficient number, since it is larger than the sum of its proper divisors (1).

222774161 is an equidigital number, since it uses as much as digits as its factorization.

222774161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 222774161 is about 14925.6209586067. The cubic root of 222774161 is about 606.2079193380.

The spelling of 222774161 in words is "two hundred twenty-two million, seven hundred seventy-four thousand, one hundred sixty-one".