51539 has 2 divisors, whose sum is σ = 51540. Its totient is φ = 51538.

The previous prime is 51521. The next prime is 51551. The reversal of 51539 is 93515.

51539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51539 - 2⁸ = 51283 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 12.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (51599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25769 + 25770.

It is an arithmetic number, because the mean of its divisors is an integer number (25770).

2⁵¹⁵³⁹ is an apocalyptic number.

51539 is a deficient number, since it is larger than the sum of its proper divisors (1).

51539 is an equidigital number, since it uses as much as digits as its factorization.

51539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 675, while the sum is 23.

The square root of 51539 is about 227.0220253632. The cubic root of 51539 is about 37.2144835112.

The spelling of 51539 in words is "fifty-one thousand, five hundred thirty-nine".