51360217 has 4 divisors (see below), whose sum is σ = 51868836. Its totient is φ = 50851600.

The previous prime is 51360203. The next prime is 51360223. The reversal of 51360217 is 71206315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25918281 + 25441936 = 5091^2 + 5044^2 .

It is a cyclic number.

It is not a de Polignac number, because 51360217 - 2²³ = 42971609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51360191 and 51360200.

It is not an unprimeable number, because it can be changed into a prime (51360227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254158 + ... + 254359.

It is an arithmetic number, because the mean of its divisors is an integer number (12967209).

Almost surely, 2^51360217 is an apocalyptic number.

It is an amenable number.

51360217 is a deficient number, since it is larger than the sum of its proper divisors (508619).

51360217 is a wasteful number, since it uses less digits than its factorization.

51360217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508618.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 51360217 is about 7166.6042865502. The cubic root of 51360217 is about 371.7140270463.

The spelling of 51360217 in words is "fifty-one million, three hundred sixty thousand, two hundred seventeen".