2278125221 has 2 divisors, whose sum is σ = 2278125222. Its totient is φ = 2278125220.

The previous prime is 2278125211. The next prime is 2278125233. The reversal of 2278125221 is 1225218722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1734722500 + 543402721 = 41650^2 + 23311^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278125221 - 2¹⁰ = 2278124197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2278125211) 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, 1139062610 + 1139062611.

It is an arithmetic number, because the mean of its divisors is an integer number (1139062611).

Almost surely, 2^2278125221 is an apocalyptic number.

It is an amenable number.

2278125221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278125221 is an equidigital number, since it uses as much as digits as its factorization.

2278125221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 2278125221 is about 47729.7100452119. The cubic root of 2278125221 is about 1315.8080247445.

The spelling of 2278125221 in words is "two billion, two hundred seventy-eight million, one hundred twenty-five thousand, two hundred twenty-one".