4777128121 has 2 divisors, whose sum is σ = 4777128122. Its totient is φ = 4777128120.

The previous prime is 4777128119. The next prime is 4777128151. The reversal of 4777128121 is 1218217774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2846756025 + 1930372096 = 53355^2 + 43936^2 .

It is a cyclic number.

It is not a de Polignac number, because 4777128121 - 2¹ = 4777128119 is a prime.

Together with 4777128119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4777128151) 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, 2388564060 + 2388564061.

It is an arithmetic number, because the mean of its divisors is an integer number (2388564061).

Almost surely, 2^4777128121 is an apocalyptic number.

It is an amenable number.

4777128121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4777128121 is an equidigital number, since it uses as much as digits as its factorization.

4777128121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43904, while the sum is 40.

The square root of 4777128121 is about 69116.7716332295. The cubic root of 4777128121 is about 1684.1817734596.

The spelling of 4777128121 in words is "four billion, seven hundred seventy-seven million, one hundred twenty-eight thousand, one hundred twenty-one".