222212909 has 2 divisors, whose sum is σ = 222212910. Its totient is φ = 222212908.

The previous prime is 222212897. The next prime is 222212911. The reversal of 222212909 is 909212222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217710025 + 4502884 = 14755^2 + 2122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222212909 is a prime.

Together with 222212911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222212009) 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, 111106454 + 111106455.

It is an arithmetic number, because the mean of its divisors is an integer number (111106455).

Almost surely, 2^222212909 is an apocalyptic number.

It is an amenable number.

222212909 is a deficient number, since it is larger than the sum of its proper divisors (1).

222212909 is an equidigital number, since it uses as much as digits as its factorization.

222212909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 222212909 is about 14906.8074717560. The cubic root of 222212909 is about 605.6984025352.

The spelling of 222212909 in words is "two hundred twenty-two million, two hundred twelve thousand, nine hundred nine".