222001209 has 32 divisors (see below), whose sum is σ = 334320000. Its totient is φ = 145582272.

The previous prime is 222001201. The next prime is 222001223. The reversal of 222001209 is 902100222.

It is not a de Polignac number, because 222001209 - 2³ = 222001201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222001191 and 222001200.

It is not an unprimeable number, because it can be changed into a prime (222001201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 558999 + ... + 559395.

It is an arithmetic number, because the mean of its divisors is an integer number (10447500).

Almost surely, 2^222001209 is an apocalyptic number.

It is an amenable number.

222001209 is a deficient number, since it is larger than the sum of its proper divisors (112318791).

222001209 is a wasteful number, since it uses less digits than its factorization.

222001209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 222001209 is about 14899.7049970796. The cubic root of 222001209 is about 605.5059938314.

It can be divided in two parts, 22200 and 1209, that added together give a square (23409 = 153²).

The spelling of 222001209 in words is "two hundred twenty-two million, one thousand, two hundred nine".