65139 has 4 divisors (see below), whose sum is σ = 86856. Its totient is φ = 43424.

The previous prime is 65129. The next prime is 65141. The reversal of 65139 is 93156.

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 65139 - 2⁴ = 65123 is a prime.

It is a D-number.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (65119) 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, 10854 + ... + 10859.

It is an arithmetic number, because the mean of its divisors is an integer number (21714).

2⁶⁵¹³⁹ is an apocalyptic number.

65139 is a deficient number, since it is larger than the sum of its proper divisors (21717).

65139 is a wasteful number, since it uses less digits than its factorization.

65139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21716.

The product of its digits is 810, while the sum is 24.

The square root of 65139 is about 255.2234315262. The cubic root of 65139 is about 40.2358977383.

The spelling of 65139 in words is "sixty-five thousand, one hundred thirty-nine".