85139 has 4 divisors (see below), whose sum is σ = 89640. Its totient is φ = 80640.

The previous prime is 85133. The next prime is 85147. The reversal of 85139 is 93158.

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 85139 - 2¹² = 81043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85133) 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, 2222 + ... + 2259.

It is an arithmetic number, because the mean of its divisors is an integer number (22410).

2⁸⁵¹³⁹ is an apocalyptic number.

85139 is a deficient number, since it is larger than the sum of its proper divisors (4501).

85139 is a wasteful number, since it uses less digits than its factorization.

85139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500.

The product of its digits is 1080, while the sum is 26.

The square root of 85139 is about 291.7858803986. The cubic root of 85139 is about 43.9922507014.

The spelling of 85139 in words is "eighty-five thousand, one hundred thirty-nine".