187135139 has 2 divisors, whose sum is σ = 187135140. Its totient is φ = 187135138.

The previous prime is 187135093. The next prime is 187135163. The reversal of 187135139 is 931531781.

It is a strong prime.

It is an emirp because it is prime and its reverse (931531781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187135139 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (187135639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93567569 + 93567570.

It is an arithmetic number, because the mean of its divisors is an integer number (93567570).

Almost surely, 2^187135139 is an apocalyptic number.

187135139 is a deficient number, since it is larger than the sum of its proper divisors (1).

187135139 is an equidigital number, since it uses as much as digits as its factorization.

187135139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 187135139 is about 13679.7346099988. The cubic root of 187135139 is about 571.9856254640.

The spelling of 187135139 in words is "one hundred eighty-seven million, one hundred thirty-five thousand, one hundred thirty-nine".