136139871 has 16 divisors (see below), whose sum is σ = 211866624. Its totient is φ = 76138464.

The previous prime is 136139867. The next prime is 136139911. The reversal of 136139871 is 178931631.

136139871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 136139871 - 2² = 136139867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136139851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67980 + ... + 69953.

It is an arithmetic number, because the mean of its divisors is an integer number (13241664).

Almost surely, 2^136139871 is an apocalyptic number.

136139871 is a deficient number, since it is larger than the sum of its proper divisors (75726753).

136139871 is a wasteful number, since it uses less digits than its factorization.

136139871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137990.

The product of its digits is 27216, while the sum is 39.

The square root of 136139871 is about 11667.8991682308. The cubic root of 136139871 is about 514.4325556331.

The spelling of 136139871 in words is "one hundred thirty-six million, one hundred thirty-nine thousand, eight hundred seventy-one".