51961729 has 2 divisors, whose sum is σ = 51961730. Its totient is φ = 51961728.

The previous prime is 51961709. The next prime is 51961733. The reversal of 51961729 is 92716915.

51961729 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., 45535504 + 6426225 = 6748^2 + 2535^2 .

It is a cyclic number.

It is not a de Polignac number, because 51961729 - 2²³ = 43573121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51961691 and 51961700.

It is not a weakly prime, because it can be changed into another prime (51961709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25980864 + 25980865.

It is an arithmetic number, because the mean of its divisors is an integer number (25980865).

Almost surely, 2^51961729 is an apocalyptic number.

It is an amenable number.

51961729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51961729 is an equidigital number, since it uses as much as digits as its factorization.

51961729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 51961729 is about 7208.4484460943. The cubic root of 51961729 is about 373.1595246606.

The spelling of 51961729 in words is "fifty-one million, nine hundred sixty-one thousand, seven hundred twenty-nine".