136437209 has 2 divisors, whose sum is σ = 136437210. Its totient is φ = 136437208.

The previous prime is 136437179. The next prime is 136437227. The reversal of 136437209 is 902734631.

136437209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81721600 + 54715609 = 9040^2 + 7397^2 .

It is a cyclic number.

It is not a de Polignac number, because 136437209 - 2⁸ = 136436953 is a prime.

It is a super-2 number, since 2×136437209² = 37230223999419362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136437229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68218604 + 68218605.

It is an arithmetic number, because the mean of its divisors is an integer number (68218605).

Almost surely, 2^136437209 is an apocalyptic number.

It is an amenable number.

136437209 is a deficient number, since it is larger than the sum of its proper divisors (1).

136437209 is an equidigital number, since it uses as much as digits as its factorization.

136437209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 136437209 is about 11680.6339297146. The cubic root of 136437209 is about 514.8068009410.

The spelling of 136437209 in words is "one hundred thirty-six million, four hundred thirty-seven thousand, two hundred nine".