137659309 has 4 divisors (see below), whose sum is σ = 137689216. Its totient is φ = 137629404.

The previous prime is 137659303. The next prime is 137659321. The reversal of 137659309 is 903956731.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 903956731 = 37 ⋅24431263.

It is a cyclic number.

It is not a de Polignac number, because 137659309 - 2⁹ = 137658797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137659303) 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, 6429 + ... + 17794.

It is an arithmetic number, because the mean of its divisors is an integer number (34422304).

Almost surely, 2^137659309 is an apocalyptic number.

It is an amenable number.

137659309 is a deficient number, since it is larger than the sum of its proper divisors (29907).

137659309 is an equidigital number, since it uses as much as digits as its factorization.

137659309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29906.

The product of its (nonzero) digits is 153090, while the sum is 43.

The square root of 137659309 is about 11732.8303916830. The cubic root of 137659309 is about 516.3393159609.

The spelling of 137659309 in words is "one hundred thirty-seven million, six hundred fifty-nine thousand, three hundred nine".