155139 has 4 divisors (see below), whose sum is σ = 206856. Its totient is φ = 103424.

The previous prime is 155137. The next prime is 155153. The reversal of 155139 is 931551.

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 155139 - 2¹ = 155137 is a prime.

It is a D-number.

155139 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155139.

It is not an unprimeable number, because it can be changed into a prime (155137) 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, 25854 + ... + 25859.

It is an arithmetic number, because the mean of its divisors is an integer number (51714).

2¹⁵⁵¹³⁹ is an apocalyptic number.

155139 is a deficient number, since it is larger than the sum of its proper divisors (51717).

155139 is an equidigital number, since it uses as much as digits as its factorization.

155139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51716.

The product of its digits is 675, while the sum is 24.

The square root of 155139 is about 393.8768843179. The cubic root of 155139 is about 53.7329060479.

The spelling of 155139 in words is "one hundred fifty-five thousand, one hundred thirty-nine".