222320261 has 2 divisors, whose sum is σ = 222320262. Its totient is φ = 222320260.

The previous prime is 222320209. The next prime is 222320269. The reversal of 222320261 is 162023222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165920161 + 56400100 = 12881^2 + 7510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222320261 is a prime.

It is a super-2 number, since 2×222320261² = 98852596902216242, which contains 22 as substring.

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 (222320269) 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 as a sum of consecutive naturals, namely, 111160130 + 111160131.

It is an arithmetic number, because the mean of its divisors is an integer number (111160131).

Almost surely, 2^222320261 is an apocalyptic number.

It is an amenable number.

222320261 is a deficient number, since it is larger than the sum of its proper divisors (1).

222320261 is an equidigital number, since it uses as much as digits as its factorization.

222320261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 222320261 is about 14910.4078079709. The cubic root of 222320261 is about 605.7959253225.

Subtracting from 222320261 its sum of digits (20), we obtain a triangular number (222320241 = T₂₁₀₈₆).

Adding to 222320261 its reverse (162023222), we get a palindrome (384343483).

The spelling of 222320261 in words is "two hundred twenty-two million, three hundred twenty thousand, two hundred sixty-one".