2218806281 has 2 divisors, whose sum is σ = 2218806282. Its totient is φ = 2218806280.

The previous prime is 2218806259. The next prime is 2218806329. The reversal of 2218806281 is 1826088122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1928615056 + 290191225 = 43916^2 + 17035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218806281 - 2¹⁴ = 2218789897 is a prime.

It is a super-2 number, since 2×2218806281² = 9846202625210101922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2218806241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109403140 + 1109403141.

It is an arithmetic number, because the mean of its divisors is an integer number (1109403141).

Almost surely, 2^2218806281 is an apocalyptic number.

It is an amenable number.

2218806281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218806281 is an equidigital number, since it uses as much as digits as its factorization.

2218806281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 2218806281 is about 47104.2066168193. The cubic root of 2218806281 is about 1304.2868895997.

The spelling of 2218806281 in words is "two billion, two hundred eighteen million, eight hundred six thousand, two hundred eighty-one".