2447218861 has 2 divisors, whose sum is σ = 2447218862. Its totient is φ = 2447218860.

The previous prime is 2447218847. The next prime is 2447218877. The reversal of 2447218861 is 1688127442.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2152032100 + 295186761 = 46390^2 + 17181^2 .

It is a cyclic number.

It is not a de Polignac number, because 2447218861 - 2⁷ = 2447218733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2447218831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1223609430 + 1223609431.

It is an arithmetic number, because the mean of its divisors is an integer number (1223609431).

Almost surely, 2^2447218861 is an apocalyptic number.

It is an amenable number.

2447218861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2447218861 is an equidigital number, since it uses as much as digits as its factorization.

2447218861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172032, while the sum is 43.

The square root of 2447218861 is about 49469.3729594382. The cubic root of 2447218861 is about 1347.5894543299.

The spelling of 2447218861 in words is "two billion, four hundred forty-seven million, two hundred eighteen thousand, eight hundred sixty-one".