2218868149 has 2 divisors, whose sum is σ = 2218868150. Its totient is φ = 2218868148.

The previous prime is 2218868147. The next prime is 2218868153. The reversal of 2218868149 is 9418688122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1536091249 + 682776900 = 39193^2 + 26130^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218868149 - 2¹ = 2218868147 is a prime.

Together with 2218868147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2218868147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109434074 + 1109434075.

It is an arithmetic number, because the mean of its divisors is an integer number (1109434075).

Almost surely, 2^2218868149 is an apocalyptic number.

It is an amenable number.

2218868149 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218868149 is an equidigital number, since it uses as much as digits as its factorization.

2218868149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 49.

The square root of 2218868149 is about 47104.8633264125. The cubic root of 2218868149 is about 1304.2990121649.

The spelling of 2218868149 in words is "two billion, two hundred eighteen million, eight hundred sixty-eight thousand, one hundred forty-nine".