137689609 has 2 divisors, whose sum is σ = 137689610. Its totient is φ = 137689608.

The previous prime is 137689597. The next prime is 137689667. The reversal of 137689609 is 906986731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94090000 + 43599609 = 9700^2 + 6603^2 .

It is a cyclic number.

It is not a de Polignac number, because 137689609 - 2⁵ = 137689577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137689309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68844804 + 68844805.

It is an arithmetic number, because the mean of its divisors is an integer number (68844805).

Almost surely, 2^137689609 is an apocalyptic number.

It is an amenable number.

137689609 is a deficient number, since it is larger than the sum of its proper divisors (1).

137689609 is an equidigital number, since it uses as much as digits as its factorization.

137689609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 137689609 is about 11734.1215691674. The cubic root of 137689609 is about 516.3771967592.

The spelling of 137689609 in words is "one hundred thirty-seven million, six hundred eighty-nine thousand, six hundred nine".