222099991 has 2 divisors, whose sum is σ = 222099992. Its totient is φ = 222099990.

The previous prime is 222099979. The next prime is 222100037. The reversal of 222099991 is 199990222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222099991 - 2¹³ = 222091799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222099971) 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, 111049995 + 111049996.

It is an arithmetic number, because the mean of its divisors is an integer number (111049996).

Almost surely, 2^222099991 is an apocalyptic number.

222099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

222099991 is an equidigital number, since it uses as much as digits as its factorization.

222099991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 222099991 is about 14903.0195262571. The cubic root of 222099991 is about 605.5957894742.

The spelling of 222099991 in words is "two hundred twenty-two million, ninety-nine thousand, nine hundred ninety-one".