51559 has 4 divisors (see below), whose sum is σ = 52704. Its totient is φ = 50416.

The previous prime is 51551. The next prime is 51563. The reversal of 51559 is 95515.

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

It is a cyclic number.

It is not a de Polignac number, because 51559 - 2³ = 51551 is a prime.

It is a Duffinian number.

51559 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551) 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, 502 + ... + 595.

It is an arithmetic number, because the mean of its divisors is an integer number (13176).

2⁵¹⁵⁵⁹ is an apocalyptic number.

51559 is a deficient number, since it is larger than the sum of its proper divisors (1145).

51559 is a wasteful number, since it uses less digits than its factorization.

51559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144.

The product of its digits is 1125, while the sum is 25.

The square root of 51559 is about 227.0660696802. The cubic root of 51559 is about 37.2192966522.

Subtracting 51559 from its reverse (95515), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 51559 in words is "fifty-one thousand, five hundred fifty-nine".