2218936481 has 2 divisors, whose sum is σ = 2218936482. Its totient is φ = 2218936480.

The previous prime is 2218936471. The next prime is 2218936483. The reversal of 2218936481 is 1846398122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2130745600 + 88190881 = 46160^2 + 9391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2218936481 is a prime.

It is a super-2 number, since 2×2218936481² = 9847358213425326722, which contains 22 as substring.

Together with 2218936483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2218936483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109468240 + 1109468241.

It is an arithmetic number, because the mean of its divisors is an integer number (1109468241).

Almost surely, 2^2218936481 is an apocalyptic number.

It is an amenable number.

2218936481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218936481 is an equidigital number, since it uses as much as digits as its factorization.

2218936481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 44.

The square root of 2218936481 is about 47105.5886387167. The cubic root of 2218936481 is about 1304.3124010399.

The spelling of 2218936481 in words is "two billion, two hundred eighteen million, nine hundred thirty-six thousand, four hundred eighty-one".