222100261 has 2 divisors, whose sum is σ = 222100262. Its totient is φ = 222100260.

The previous prime is 222100247. The next prime is 222100271. The reversal of 222100261 is 162001222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221444161 + 656100 = 14881^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 222100261 - 2¹¹ = 222098213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222100211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111050130 + 111050131.

It is an arithmetic number, because the mean of its divisors is an integer number (111050131).

Almost surely, 2^222100261 is an apocalyptic number.

It is an amenable number.

222100261 is a deficient number, since it is larger than the sum of its proper divisors (1).

222100261 is an equidigital number, since it uses as much as digits as its factorization.

222100261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 222100261 is about 14903.0285848213. The cubic root of 222100261 is about 605.5960348754.

Adding to 222100261 its reverse (162001222), we get a palindrome (384101483).

The spelling of 222100261 in words is "two hundred twenty-two million, one hundred thousand, two hundred sixty-one".