188315139 has 4 divisors (see below), whose sum is σ = 251086856. Its totient is φ = 125543424.

The previous prime is 188315129. The next prime is 188315147. The reversal of 188315139 is 931513881.

188315139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931513881 = 3 ⋅310504627.

It is not a de Polignac number, because 188315139 - 2⁴ = 188315123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 188315097 and 188315106.

It is not an unprimeable number, because it can be changed into a prime (188315119) 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, 31385854 + ... + 31385859.

It is an arithmetic number, because the mean of its divisors is an integer number (62771714).

Almost surely, 2^188315139 is an apocalyptic number.

188315139 is a deficient number, since it is larger than the sum of its proper divisors (62771717).

188315139 is an equidigital number, since it uses as much as digits as its factorization.

188315139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62771716.

The product of its digits is 25920, while the sum is 39.

The square root of 188315139 is about 13722.7963258222. The cubic root of 188315139 is about 573.1853455334.

The spelling of 188315139 in words is "one hundred eighty-eight million, three hundred fifteen thousand, one hundred thirty-nine".