51256717 has 8 divisors (see below), whose sum is σ = 56143800. Its totient is φ = 46577664.

The previous prime is 51256703. The next prime is 51256721. The reversal of 51256717 is 71765215.

It is a happy number.

51256717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10883401 + 40373316 = 3299^2 + 6354^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51256717 - 2⁷ = 51256589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51256727) 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 in 7 ways as a sum of consecutive naturals, for example, 51492 + ... + 52477.

It is an arithmetic number, because the mean of its divisors is an integer number (7017975).

Almost surely, 2^51256717 is an apocalyptic number.

It is an amenable number.

51256717 is a deficient number, since it is larger than the sum of its proper divisors (4887083).

51256717 is a wasteful number, since it uses less digits than its factorization.

51256717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104015.

The product of its digits is 14700, while the sum is 34.

The square root of 51256717 is about 7159.3796518972. The cubic root of 51256717 is about 371.4641691086.

The spelling of 51256717 in words is "fifty-one million, two hundred fifty-six thousand, seven hundred seventeen".