4278582821 has 2 divisors, whose sum is σ = 4278582822. Its totient is φ = 4278582820.

The previous prime is 4278582793. The next prime is 4278582857. The reversal of 4278582821 is 1282858724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4168122721 + 110460100 = 64561^2 + 10510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4278582821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4278582871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2139291410 + 2139291411.

It is an arithmetic number, because the mean of its divisors is an integer number (2139291411).

Almost surely, 2^4278582821 is an apocalyptic number.

It is an amenable number.

4278582821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4278582821 is an equidigital number, since it uses as much as digits as its factorization.

4278582821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 573440, while the sum is 47.

The square root of 4278582821 is about 65410.8769318987. The cubic root of 4278582821 is about 1623.4290548661.

The spelling of 4278582821 in words is "four billion, two hundred seventy-eight million, five hundred eighty-two thousand, eight hundred twenty-one".