222991 has 2 divisors, whose sum is σ = 222992. Its totient is φ = 222990.
The previous prime is 222979. The next prime is 223007. The reversal of 222991 is 199222.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 222991 - 27 = 222863 is a prime.
222991 is a lucky number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (222931) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111495 + 111496.
It is an arithmetic number, because the mean of its divisors is an integer number (111496).
2222991 is an apocalyptic number.
222991 is a deficient number, since it is larger than the sum of its proper divisors (1).
222991 is an equidigital number, since it uses as much as digits as its factorization.
222991 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 648, while the sum is 25.
The square root of 222991 is about 472.2192287487. The cubic root of 222991 is about 60.6404541323.
The spelling of 222991 in words is "two hundred twenty-two thousand, nine hundred ninety-one".
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