2218342949 has 2 divisors, whose sum is σ = 2218342950. Its totient is φ = 2218342948.

The previous prime is 2218342921. The next prime is 2218342993. The reversal of 2218342949 is 9492438122.

It is a happy number.

It is an a-pointer prime, because the next prime (2218342993) can be obtained adding 2218342949 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2199141025 + 19201924 = 46895^2 + 4382^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2218342949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2218392949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109171474 + 1109171475.

It is an arithmetic number, because the mean of its divisors is an integer number (1109171475).

Almost surely, 2^2218342949 is an apocalyptic number.

It is an amenable number.

2218342949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218342949 is an equidigital number, since it uses as much as digits as its factorization.

2218342949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 2218342949 is about 47099.2882005663. The cubic root of 2218342949 is about 1304.1960960459.

The spelling of 2218342949 in words is "two billion, two hundred eighteen million, three hundred forty-two thousand, nine hundred forty-nine".