137138609 has 4 divisors (see below), whose sum is σ = 145205604. Its totient is φ = 129071616.

The previous prime is 137138591. The next prime is 137138611. The reversal of 137138609 is 906831731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127057984 + 10080625 = 11272^2 + 3175^2 .

It is not a de Polignac number, because 137138609 - 2¹² = 137134513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137138009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4033472 + ... + 4033505.

It is an arithmetic number, because the mean of its divisors is an integer number (36301401).

Almost surely, 2^137138609 is an apocalyptic number.

It is an amenable number.

137138609 is a deficient number, since it is larger than the sum of its proper divisors (8066995).

137138609 is an equidigital number, since it uses as much as digits as its factorization.

137138609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8066994.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 137138609 is about 11710.6194968499. The cubic root of 137138609 is about 515.6874709936.

It can be divided in two parts, 13713 and 8609, that added together give a palindrome (22322).

The spelling of 137138609 in words is "one hundred thirty-seven million, one hundred thirty-eight thousand, six hundred nine".