68539 has 2 divisors, whose sum is σ = 68540. Its totient is φ = 68538.

The previous prime is 68531. The next prime is 68543. The reversal of 68539 is 93586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68539 - 2³ = 68531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68539.

It is not a weakly prime, because it can be changed into another prime (68531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34269 + 34270.

It is an arithmetic number, because the mean of its divisors is an integer number (34270).

2⁶⁸⁵³⁹ is an apocalyptic number.

68539 is a deficient number, since it is larger than the sum of its proper divisors (1).

68539 is an equidigital number, since it uses as much as digits as its factorization.

68539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 68539 is about 261.7995416344. The cubic root of 68539 is about 40.9241110577.

The spelling of 68539 in words is "sixty-eight thousand, five hundred thirty-nine".