2278422721 has 2 divisors, whose sum is σ = 2278422722. Its totient is φ = 2278422720.

The previous prime is 2278422719. The next prime is 2278422733. The reversal of 2278422721 is 1272248722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1933800625 + 344622096 = 43975^2 + 18564^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278422721 - 2¹ = 2278422719 is a prime.

Together with 2278422719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2278426721) 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, 1139211360 + 1139211361.

It is an arithmetic number, because the mean of its divisors is an integer number (1139211361).

Almost surely, 2^2278422721 is an apocalyptic number.

It is an amenable number.

2278422721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278422721 is an equidigital number, since it uses as much as digits as its factorization.

2278422721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50176, while the sum is 37.

The square root of 2278422721 is about 47732.8264509865. The cubic root of 2278422721 is about 1315.8652993030.

The spelling of 2278422721 in words is "two billion, two hundred seventy-eight million, four hundred twenty-two thousand, seven hundred twenty-one".