222222999991 has 2 divisors, whose sum is σ = 222222999992. Its totient is φ = 222222999990.

The previous prime is 222222999919. The next prime is 222223000003. The reversal of 222222999991 is 199999222222.

Together with previous prime (222222999919) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222222999991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222222997991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111111499995 + 111111499996.

It is an arithmetic number, because the mean of its divisors is an integer number (111111499996).

Almost surely, 2^222222999991 is an apocalyptic number.

222222999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

222222999991 is an equidigital number, since it uses as much as digits as its factorization.

222222999991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 58.

The spelling of 222222999991 in words is "two hundred twenty-two billion, two hundred twenty-two million, nine hundred ninety-nine thousand, nine hundred ninety-one".