4647256121 has 2 divisors, whose sum is σ = 4647256122. Its totient is φ = 4647256120.

The previous prime is 4647256109. The next prime is 4647256157. The reversal of 4647256121 is 1216527464.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2387299600 + 2259956521 = 48860^2 + 47539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4647256121 is a prime.

It is not a weakly prime, because it can be changed into another prime (4647256171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2323628060 + 2323628061.

It is an arithmetic number, because the mean of its divisors is an integer number (2323628061).

Almost surely, 2^4647256121 is an apocalyptic number.

It is an amenable number.

4647256121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4647256121 is an equidigital number, since it uses as much as digits as its factorization.

4647256121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 4647256121 is about 68170.7864191106. The cubic root of 4647256121 is about 1668.7791669055.

The spelling of 4647256121 in words is "four billion, six hundred forty-seven million, two hundred fifty-six thousand, one hundred twenty-one".