136309409 has 4 divisors (see below), whose sum is σ = 136334016. Its totient is φ = 136284804.

The previous prime is 136309403. The next prime is 136309429. The reversal of 136309409 is 904903631.

136309409 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904903631 = 3659 ⋅247309.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136309409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136309403) 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, 332 + ... + 16514.

It is an arithmetic number, because the mean of its divisors is an integer number (34083504).

Almost surely, 2^136309409 is an apocalyptic number.

It is an amenable number.

136309409 is a deficient number, since it is larger than the sum of its proper divisors (24607).

136309409 is an equidigital number, since it uses as much as digits as its factorization.

136309409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24606.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 136309409 is about 11675.1620545498. The cubic root of 136309409 is about 514.6460118064.

The spelling of 136309409 in words is "one hundred thirty-six million, three hundred nine thousand, four hundred nine".