51856559 has 8 divisors (see below), whose sum is σ = 54184032. Its totient is φ = 49535200.

The previous prime is 51856543. The next prime is 51856589. The reversal of 51856559 is 95565815.

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 51856559 - 2⁴ = 51856543 is a prime.

It is a super-2 number, since 2×51856559² = 5378205422640962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51856589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29057 + ... + 30789.

It is an arithmetic number, because the mean of its divisors is an integer number (6773004).

Almost surely, 2^51856559 is an apocalyptic number.

51856559 is a deficient number, since it is larger than the sum of its proper divisors (2327473).

51856559 is a wasteful number, since it uses less digits than its factorization.

51856559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057.

The product of its digits is 270000, while the sum is 44.

The square root of 51856559 is about 7201.1498387410. The cubic root of 51856559 is about 372.9075976169.

The spelling of 51856559 in words is "fifty-one million, eight hundred fifty-six thousand, five hundred fifty-nine".