318139 has 4 divisors (see below), whose sum is σ = 322056. Its totient is φ = 314224.

The previous prime is 318137. The next prime is 318161. The reversal of 318139 is 931813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931813 = 367 ⋅2539.

It is a cyclic number.

It is not a de Polignac number, because 318139 - 2¹ = 318137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318137) 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, 1834 + ... + 1999.

It is an arithmetic number, because the mean of its divisors is an integer number (80514).

2³¹⁸¹³⁹ is an apocalyptic number.

318139 is a deficient number, since it is larger than the sum of its proper divisors (3917).

318139 is an equidigital number, since it uses as much as digits as its factorization.

318139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916.

The product of its digits is 648, while the sum is 25.

The square root of 318139 is about 564.0381192792. The cubic root of 318139 is about 68.2661856088.

The spelling of 318139 in words is "three hundred eighteen thousand, one hundred thirty-nine".