136171987 has 4 divisors (see below), whose sum is σ = 155625136. Its totient is φ = 116718840.

The previous prime is 136171969. The next prime is 136171991. The reversal of 136171987 is 789171631.

It is a happy number.

136171987 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.

It is not a de Polignac number, because 136171987 - 2⁷ = 136171859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136171687) 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, 9726564 + ... + 9726577.

It is an arithmetic number, because the mean of its divisors is an integer number (38906284).

Almost surely, 2^136171987 is an apocalyptic number.

136171987 is a deficient number, since it is larger than the sum of its proper divisors (19453149).

136171987 is an equidigital number, since it uses as much as digits as its factorization.

136171987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19453148.

The product of its digits is 63504, while the sum is 43.

The square root of 136171987 is about 11669.2753416825. The cubic root of 136171987 is about 514.4730047605.

The spelling of 136171987 in words is "one hundred thirty-six million, one hundred seventy-one thousand, nine hundred eighty-seven".