6618281 has 2 divisors, whose sum is σ = 6618282. Its totient is φ = 6618280.

The previous prime is 6618277. The next prime is 6618299. The reversal of 6618281 is 1828166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4243600 + 2374681 = 2060^2 + 1541^2 .

It is a cyclic number.

It is not a de Polignac number, because 6618281 - 2² = 6618277 is a prime.

It is a super-2 number, since 2×6618281² = 87603286789922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6618581) 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, 3309140 + 3309141.

It is an arithmetic number, because the mean of its divisors is an integer number (3309141).

Almost surely, 2^6618281 is an apocalyptic number.

It is an amenable number.

6618281 is a deficient number, since it is larger than the sum of its proper divisors (1).

6618281 is an equidigital number, since it uses as much as digits as its factorization.

6618281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 6618281 is about 2572.6019902037. The cubic root of 6618281 is about 187.7507731928.

The spelling of 6618281 in words is "six million, six hundred eighteen thousand, two hundred eighty-one".