115139 has 4 divisors (see below), whose sum is σ = 116424. Its totient is φ = 113856.

The previous prime is 115133. The next prime is 115151. The reversal of 115139 is 931511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931511 = 7 ⋅133073.

It is a cyclic number.

It is not a de Polignac number, because 115139 - 2⁴ = 115123 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 115139.

It is not an unprimeable number, because it can be changed into a prime (115133) 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, 497 + ... + 690.

It is an arithmetic number, because the mean of its divisors is an integer number (29106).

2¹¹⁵¹³⁹ is an apocalyptic number.

115139 is a deficient number, since it is larger than the sum of its proper divisors (1285).

115139 is an equidigital number, since it uses as much as digits as its factorization.

115139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284.

The product of its digits is 135, while the sum is 20.

The square root of 115139 is about 339.3213815839. The cubic root of 115139 is about 48.6490261538.

The spelling of 115139 in words is "one hundred fifteen thousand, one hundred thirty-nine".