51243754769 has 2 divisors, whose sum is σ = 51243754770. Its totient is φ = 51243754768.

The previous prime is 51243754763. The next prime is 51243754781. The reversal of 51243754769 is 96745734215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50492337025 + 751417744 = 224705^2 + 27412^2 .

It is a cyclic number.

It is not a de Polignac number, because 51243754769 - 2⁴ = 51243754753 is a prime.

It is a super-2 number, since 2×51243754769² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51243754769.

It is not a weakly prime, because it can be changed into another prime (51243754763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25621877384 + 25621877385.

It is an arithmetic number, because the mean of its divisors is an integer number (25621877385).

Almost surely, 2^51243754769 is an apocalyptic number.

It is an amenable number.

51243754769 is a deficient number, since it is larger than the sum of its proper divisors (1).

51243754769 is an equidigital number, since it uses as much as digits as its factorization.

51243754769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 53.

The spelling of 51243754769 in words is "fifty-one billion, two hundred forty-three million, seven hundred fifty-four thousand, seven hundred sixty-nine".