222109991 has 2 divisors, whose sum is σ = 222109992. Its totient is φ = 222109990.

The previous prime is 222109969. The next prime is 222110027. The reversal of 222109991 is 199901222.

222109991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222109991 - 2¹⁴ = 222093607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222109931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111054995 + 111054996.

It is an arithmetic number, because the mean of its divisors is an integer number (111054996).

Almost surely, 2^222109991 is an apocalyptic number.

222109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

222109991 is an equidigital number, since it uses as much as digits as its factorization.

222109991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 222109991 is about 14903.3550249600. The cubic root of 222109991 is about 605.6048782739.

The spelling of 222109991 in words is "two hundred twenty-two million, one hundred nine thousand, nine hundred ninety-one".