222001009 has 2 divisors, whose sum is σ = 222001010. Its totient is φ = 222001008.

The previous prime is 222001001. The next prime is 222001027. The reversal of 222001009 is 900100222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186240609 + 35760400 = 13647^2 + 5980^2 .

It is a cyclic number.

It is not a de Polignac number, because 222001009 - 2³ = 222001001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222000983 and 222001001.

It is not a weakly prime, because it can be changed into another prime (222001001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111000504 + 111000505.

It is an arithmetic number, because the mean of its divisors is an integer number (111000505).

Almost surely, 2^222001009 is an apocalyptic number.

It is an amenable number.

222001009 is a deficient number, since it is larger than the sum of its proper divisors (1).

222001009 is an equidigital number, since it uses as much as digits as its factorization.

222001009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 222001009 is about 14899.6982855359. The cubic root of 222001009 is about 605.5058119987.

The spelling of 222001009 in words is "two hundred twenty-two million, one thousand, nine".