51339 has 8 divisors (see below), whose sum is σ = 69520. Its totient is φ = 33696.

The previous prime is 51329. The next prime is 51341. The reversal of 51339 is 93315.

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

It is not a de Polignac number, because 51339 - 2⁵ = 51307 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 (51329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249 + ... + 405.

It is an arithmetic number, because the mean of its divisors is an integer number (8690).

2⁵¹³³⁹ is an apocalyptic number.

51339 is a deficient number, since it is larger than the sum of its proper divisors (18181).

51339 is a wasteful number, since it uses less digits than its factorization.

51339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its digits is 405, while the sum is 21.

The square root of 51339 is about 226.5811113045. The cubic root of 51339 is about 37.1662834747.

Adding to 51339 its sum of digits (21), we get a triangular number (51360 = T₃₂₀).

The spelling of 51339 in words is "fifty-one thousand, three hundred thirty-nine".