136909837 has 4 divisors (see below), whose sum is σ = 137226460. Its totient is φ = 136593216.

The previous prime is 136909819. The next prime is 136909847. The reversal of 136909837 is 738909631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 738909631 = 1487 ⋅496913.

It can be written as a sum of positive squares in 2 ways, for example, as 63138916 + 73770921 = 7946^2 + 8589^2 .

It is a cyclic number.

It is not a de Polignac number, because 136909837 - 2⁷ = 136909709 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 (136909847) 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, 157662 + ... + 158527.

It is an arithmetic number, because the mean of its divisors is an integer number (34306615).

Almost surely, 2^136909837 is an apocalyptic number.

It is an amenable number.

136909837 is a deficient number, since it is larger than the sum of its proper divisors (316623).

136909837 is an equidigital number, since it uses as much as digits as its factorization.

136909837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316622.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 136909837 is about 11700.8477043332. The cubic root of 136909837 is about 515.4005580739.

The spelling of 136909837 in words is "one hundred thirty-six million, nine hundred nine thousand, eight hundred thirty-seven".