2218398209 has 2 divisors, whose sum is σ = 2218398210. Its totient is φ = 2218398208.

The previous prime is 2218398179. The next prime is 2218398269. The reversal of 2218398209 is 9028938122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1809226225 + 409171984 = 42535^2 + 20228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2218398209 is a prime.

It is a super-2 number, since 2×2218398209² = 9842581227388815362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2218398209.

It is not a weakly prime, because it can be changed into another prime (2218398269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109199104 + 1109199105.

It is an arithmetic number, because the mean of its divisors is an integer number (1109199105).

Almost surely, 2^2218398209 is an apocalyptic number.

It is an amenable number.

2218398209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218398209 is an equidigital number, since it uses as much as digits as its factorization.

2218398209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 2218398209 is about 47099.8748299823. The cubic root of 2218398209 is about 1304.2069253419.

The spelling of 2218398209 in words is "two billion, two hundred eighteen million, three hundred ninety-eight thousand, two hundred nine".