136960209 has 27 divisors (see below), whose sum is σ = 204594793. Its totient is φ = 88287432.

The previous prime is 136960169. The next prime is 136960247. The reversal of 136960209 is 902069631.

136960209 = T₁₇₇₅ + T₁₇₇₆ + ... + T₁₈₅₇.

The square root of 136960209 is 11703.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 136960209 - 2⁷ = 136960081 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136960249) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1650082 + ... + 1650164.

Almost surely, 2^136960209 is an apocalyptic number.

136960209 is the 11703-rd square number.

136960209 is the 5852-nd centered octagonal number.

It is an amenable number.

136960209 is a deficient number, since it is larger than the sum of its proper divisors (67634584).

136960209 is an frugal number, since it uses more digits than its factorization.

136960209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The cubic root of 136960209 is about 515.4637592146.

Multiplying 136960209 by its sum of digits (36), we get a square (4930567524 = 70218²).

The spelling of 136960209 in words is "one hundred thirty-six million, nine hundred sixty thousand, two hundred nine".