222222779 has 2 divisors, whose sum is σ = 222222780. Its totient is φ = 222222778.

The previous prime is 222222773. The next prime is 222222797. The reversal of 222222779 is 977222222.

It is a happy number.

Together with next prime (222222797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222222779 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (222222773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111111389 + 111111390.

It is an arithmetic number, because the mean of its divisors is an integer number (111111390).

Almost surely, 2^222222779 is an apocalyptic number.

222222779 is a deficient number, since it is larger than the sum of its proper divisors (1).

222222779 is an equidigital number, since it uses as much as digits as its factorization.

222222779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 222222779 is about 14907.1385248813. The cubic root of 222222779 is about 605.7073701431.

The spelling of 222222779 in words is "two hundred twenty-two million, two hundred twenty-two thousand, seven hundred seventy-nine".