4379728121 has 2 divisors, whose sum is σ = 4379728122. Its totient is φ = 4379728120.

The previous prime is 4379728099. The next prime is 4379728123. The reversal of 4379728121 is 1218279734.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4298638096 + 81090025 = 65564^2 + 9005^2 .

It is a cyclic number.

It is not a de Polignac number, because 4379728121 - 2¹⁰ = 4379727097 is a prime.

It is a Sophie Germain prime.

Together with 4379728123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4379728123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2189864060 + 2189864061.

It is an arithmetic number, because the mean of its divisors is an integer number (2189864061).

Almost surely, 2^4379728121 is an apocalyptic number.

It is an amenable number.

4379728121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4379728121 is an equidigital number, since it uses as much as digits as its factorization.

4379728121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 4379728121 is about 66179.5143605633. The cubic root of 4379728121 is about 1636.1221238265.

The spelling of 4379728121 in words is "four billion, three hundred seventy-nine million, seven hundred twenty-eight thousand, one hundred twenty-one".