51271729 has 2 divisors, whose sum is σ = 51271730. Its totient is φ = 51271728.

The previous prime is 51271721. The next prime is 51271733. The reversal of 51271729 is 92717215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43560000 + 7711729 = 6600^2 + 2777^2 .

It is a cyclic number.

It is not a de Polignac number, because 51271729 - 2³ = 51271721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51271694 and 51271703.

It is not a weakly prime, because it can be changed into another prime (51271721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25635864 + 25635865.

It is an arithmetic number, because the mean of its divisors is an integer number (25635865).

Almost surely, 2^51271729 is an apocalyptic number.

It is an amenable number.

51271729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51271729 is an equidigital number, since it uses as much as digits as its factorization.

51271729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 34.

The square root of 51271729 is about 7160.4279900017. The cubic root of 51271729 is about 371.5004302149.

The spelling of 51271729 in words is "fifty-one million, two hundred seventy-one thousand, seven hundred twenty-nine".