136804309 has 4 divisors (see below), whose sum is σ = 136899916. Its totient is φ = 136708704.

The previous prime is 136804307. The next prime is 136804361. The reversal of 136804309 is 903408631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903408631 = 277 ⋅3261403.

It can be written as a sum of positive squares in 2 ways, for example, as 102616900 + 34187409 = 10130^2 + 5847^2 .

It is a cyclic number.

It is not a de Polignac number, because 136804309 - 2¹ = 136804307 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 (136804301) 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, 45624 + ... + 48529.

It is an arithmetic number, because the mean of its divisors is an integer number (34224979).

Almost surely, 2^136804309 is an apocalyptic number.

It is an amenable number.

136804309 is a deficient number, since it is larger than the sum of its proper divisors (95607).

136804309 is an equidigital number, since it uses as much as digits as its factorization.

136804309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95606.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 136804309 is about 11696.3374181835. The cubic root of 136804309 is about 515.2681030914.

The spelling of 136804309 in words is "one hundred thirty-six million, eight hundred four thousand, three hundred nine".