136705871 has 4 divisors (see below), whose sum is σ = 137199672. Its totient is φ = 136212072.

The previous prime is 136705867. The next prime is 136705909. The reversal of 136705871 is 178507631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178507631 = 67 ⋅2664293.

It is a cyclic number.

It is not a de Polignac number, because 136705871 - 2² = 136705867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136705801) 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, 246485 + ... + 247038.

It is an arithmetic number, because the mean of its divisors is an integer number (34299918).

Almost surely, 2^136705871 is an apocalyptic number.

136705871 is a deficient number, since it is larger than the sum of its proper divisors (493801).

136705871 is an equidigital number, since it uses as much as digits as its factorization.

136705871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493800.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 136705871 is about 11692.1285914927. The cubic root of 136705871 is about 515.1444858056.

The spelling of 136705871 in words is "one hundred thirty-six million, seven hundred five thousand, eight hundred seventy-one".