5120550781 has 2 divisors, whose sum is σ = 5120550782. Its totient is φ = 5120550780.

The previous prime is 5120550737. The next prime is 5120550847. The reversal of 5120550781 is 1870550215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4765831225 + 354719556 = 69035^2 + 18834^2 .

It is a cyclic number.

It is not a de Polignac number, because 5120550781 - 2⁹ = 5120550269 is a prime.

It is a super-2 number, since 2×5120550781² = 52440080601599419922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5120550181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560275390 + 2560275391.

It is an arithmetic number, because the mean of its divisors is an integer number (2560275391).

Almost surely, 2^5120550781 is an apocalyptic number.

It is an amenable number.

5120550781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5120550781 is an equidigital number, since it uses as much as digits as its factorization.

5120550781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14000, while the sum is 34.

The square root of 5120550781 is about 71558.0238757332. The cubic root of 5120550781 is about 1723.6095530227.

The spelling of 5120550781 in words is "five billion, one hundred twenty million, five hundred fifty thousand, seven hundred eighty-one".