222106861 has 2 divisors, whose sum is σ = 222106862. Its totient is φ = 222106860.

The previous prime is 222106813. The next prime is 222106867. The reversal of 222106861 is 168601222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221831236 + 275625 = 14894^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 222106861 - 2⁷ = 222106733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222106867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111053430 + 111053431.

It is an arithmetic number, because the mean of its divisors is an integer number (111053431).

Almost surely, 2^222106861 is an apocalyptic number.

It is an amenable number.

222106861 is a deficient number, since it is larger than the sum of its proper divisors (1).

222106861 is an equidigital number, since it uses as much as digits as its factorization.

222106861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 222106861 is about 14903.2500146780. The cubic root of 222106861 is about 605.6020335089.

The spelling of 222106861 in words is "two hundred twenty-two million, one hundred six thousand, eight hundred sixty-one".