222218261 has 4 divisors (see below), whose sum is σ = 229386624. Its totient is φ = 215049900.

The previous prime is 222218257. The next prime is 222218273. The reversal of 222218261 is 162812222.

222218261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222218261 - 2² = 222218257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 222218261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222218221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3584135 + ... + 3584196.

It is an arithmetic number, because the mean of its divisors is an integer number (57346656).

Almost surely, 2^222218261 is an apocalyptic number.

It is an amenable number.

222218261 is a deficient number, since it is larger than the sum of its proper divisors (7168363).

222218261 is an equidigital number, since it uses as much as digits as its factorization.

222218261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7168362.

The product of its digits is 1536, while the sum is 26.

The square root of 222218261 is about 14906.9869859741. The cubic root of 222218261 is about 605.7032652468.

The spelling of 222218261 in words is "two hundred twenty-two million, two hundred eighteen thousand, two hundred sixty-one".