136814209 has 4 divisors (see below), whose sum is σ = 156359104. Its totient is φ = 117269316.

The previous prime is 136814203. The next prime is 136814221. The reversal of 136814209 is 902418631.

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.

It is a cyclic number.

It is not a de Polignac number, because 136814209 - 2⁷ = 136814081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136814203) 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, 9772437 + ... + 9772450.

It is an arithmetic number, because the mean of its divisors is an integer number (39089776).

Almost surely, 2^136814209 is an apocalyptic number.

It is an amenable number.

136814209 is a deficient number, since it is larger than the sum of its proper divisors (19544895).

136814209 is an equidigital number, since it uses as much as digits as its factorization.

136814209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19544894.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 136814209 is about 11696.7606199323. The cubic root of 136814209 is about 515.2805321131.

The spelling of 136814209 in words is "one hundred thirty-six million, eight hundred fourteen thousand, two hundred nine".