222215261 has 2 divisors, whose sum is σ = 222215262. Its totient is φ = 222215260.

The previous prime is 222215249. The next prime is 222215267. The reversal of 222215261 is 162512222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134699236 + 87516025 = 11606^2 + 9355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222215261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222215267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111107630 + 111107631.

It is an arithmetic number, because the mean of its divisors is an integer number (111107631).

Almost surely, 2^222215261 is an apocalyptic number.

It is an amenable number.

222215261 is a deficient number, since it is larger than the sum of its proper divisors (1).

222215261 is an equidigital number, since it uses as much as digits as its factorization.

222215261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 222215261 is about 14906.8863616786. The cubic root of 222215261 is about 605.7005395212.

Adding to 222215261 its reverse (162512222), we get a palindrome (384727483).

The spelling of 222215261 in words is "two hundred twenty-two million, two hundred fifteen thousand, two hundred sixty-one".