51275236709 has 2 divisors, whose sum is σ = 51275236710. Its totient is φ = 51275236708.

The previous prime is 51275236703. The next prime is 51275236763. The reversal of 51275236709 is 90763257215.

51275236709 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., 48709814209 + 2565422500 = 220703^2 + 50650^2 .

It is a cyclic number.

It is not a de Polignac number, because 51275236709 - 2⁴ = 51275236693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51275236703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25637618354 + 25637618355.

It is an arithmetic number, because the mean of its divisors is an integer number (25637618355).

Almost surely, 2^51275236709 is an apocalyptic number.

It is an amenable number.

51275236709 is a deficient number, since it is larger than the sum of its proper divisors (1).

51275236709 is an equidigital number, since it uses as much as digits as its factorization.

51275236709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 793800, while the sum is 47.

The spelling of 51275236709 in words is "fifty-one billion, two hundred seventy-five million, two hundred thirty-six thousand, seven hundred nine".