51816713 has 8 divisors (see below), whose sum is σ = 56088648. Its totient is φ = 47585664.

The previous prime is 51816689. The next prime is 51816719. The reversal of 51816713 is 31761815.

It can be written as a sum of positive squares in 4 ways, for example, as 13227769 + 38588944 = 3637^2 + 6212^2 .

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 51816713 - 2¹⁰ = 51815689 is a prime.

It is a super-2 number, since 2×51816713² = 5369943492248738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51816713.

It is not an unprimeable number, because it can be changed into a prime (51816719) 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 in 7 ways as a sum of consecutive naturals, for example, 7556 + ... + 12677.

It is an arithmetic number, because the mean of its divisors is an integer number (7011081).

Almost surely, 2^51816713 is an apocalyptic number.

It is an amenable number.

51816713 is a deficient number, since it is larger than the sum of its proper divisors (4271935).

51816713 is a wasteful number, since it uses less digits than its factorization.

51816713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20443.

The product of its digits is 5040, while the sum is 32.

The square root of 51816713 is about 7198.3826655715. The cubic root of 51816713 is about 372.8120604670.

The spelling of 51816713 in words is "fifty-one million, eight hundred sixteen thousand, seven hundred thirteen".