137129209 has 8 divisors (see below), whose sum is σ = 156790080. Its totient is φ = 117486096.

The previous prime is 137129207. The next prime is 137129219. The reversal of 137129209 is 902921731.

It is a happy number.

137129209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 137129209 - 2¹ = 137129207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137129207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26607 + ... + 31339.

It is an arithmetic number, because the mean of its divisors is an integer number (19598760).

Almost surely, 2^137129209 is an apocalyptic number.

It is an amenable number.

137129209 is a deficient number, since it is larger than the sum of its proper divisors (19660871).

137129209 is an equidigital number, since it uses as much as digits as its factorization.

137129209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8879.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 137129209 is about 11710.2181448511. The cubic root of 137129209 is about 515.6756883331.

The spelling of 137129209 in words is "one hundred thirty-seven million, one hundred twenty-nine thousand, two hundred nine".