4278121 has 2 divisors, whose sum is σ = 4278122. Its totient is φ = 4278120.

The previous prime is 4278103. The next prime is 4278133. The reversal of 4278121 is 1218724.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3759721 + 518400 = 1939^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 4278121 - 2⁵ = 4278089 is a prime.

It is not a weakly prime, because it can be changed into another prime (4248121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2139060 + 2139061.

It is an arithmetic number, because the mean of its divisors is an integer number (2139061).

Almost surely, 2^4278121 is an apocalyptic number.

It is an amenable number.

4278121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4278121 is an equidigital number, since it uses as much as digits as its factorization.

4278121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 25.

The square root of 4278121 is about 2068.3619122388. The cubic root of 4278121 is about 162.3370642954.

The spelling of 4278121 in words is "four million, two hundred seventy-eight thousand, one hundred twenty-one".