4120555781 has 2 divisors, whose sum is σ = 4120555782. Its totient is φ = 4120555780.

The previous prime is 4120555763. The next prime is 4120555843. The reversal of 4120555781 is 1875550214.

4120555781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2477550625 + 1643005156 = 49775^2 + 40534^2 .

It is a cyclic number.

It is not a de Polignac number, because 4120555781 - 2⁶ = 4120555717 is a prime.

It is a super-3 number, since 3×4120555781³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4120555721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2060277890 + 2060277891.

It is an arithmetic number, because the mean of its divisors is an integer number (2060277891).

Almost surely, 2^4120555781 is an apocalyptic number.

It is an amenable number.

4120555781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4120555781 is an equidigital number, since it uses as much as digits as its factorization.

4120555781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56000, while the sum is 38.

The square root of 4120555781 is about 64191.5553714038. Note that the first 3 decimals coincide. The cubic root of 4120555781 is about 1603.1909990401.

The spelling of 4120555781 in words is "four billion, one hundred twenty million, five hundred fifty-five thousand, seven hundred eighty-one".