222123231991 has 2 divisors, whose sum is σ = 222123231992. Its totient is φ = 222123231990.

The previous prime is 222123231983. The next prime is 222123232003. The reversal of 222123231991 is 199132321222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222123231991 - 2³ = 222123231983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222123231991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222123231901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111061615995 + 111061615996.

It is an arithmetic number, because the mean of its divisors is an integer number (111061615996).

Almost surely, 2^222123231991 is an apocalyptic number.

222123231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

222123231991 is an equidigital number, since it uses as much as digits as its factorization.

222123231991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The spelling of 222123231991 in words is "two hundred twenty-two billion, one hundred twenty-three million, two hundred thirty-one thousand, nine hundred ninety-one".