51273312749 has 2 divisors, whose sum is σ = 51273312750. Its totient is φ = 51273312748.

The previous prime is 51273312691. The next prime is 51273312767. The reversal of 51273312749 is 94721337215.

51273312749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29676952900 + 21596359849 = 172270^2 + 146957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51273312749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51273312799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25636656374 + 25636656375.

It is an arithmetic number, because the mean of its divisors is an integer number (25636656375).

Almost surely, 2^51273312749 is an apocalyptic number.

It is an amenable number.

51273312749 is a deficient number, since it is larger than the sum of its proper divisors (1).

51273312749 is an equidigital number, since it uses as much as digits as its factorization.

51273312749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The spelling of 51273312749 in words is "fifty-one billion, two hundred seventy-three million, three hundred twelve thousand, seven hundred forty-nine".