136706509 has 2 divisors, whose sum is σ = 136706510. Its totient is φ = 136706508.

The previous prime is 136706489. The next prime is 136706513. The reversal of 136706509 is 905607631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92217609 + 44488900 = 9603^2 + 6670^2 .

It is a cyclic number.

It is not a de Polignac number, because 136706509 - 2¹¹ = 136704461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136706569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68353254 + 68353255.

It is an arithmetic number, because the mean of its divisors is an integer number (68353255).

Almost surely, 2^136706509 is an apocalyptic number.

It is an amenable number.

136706509 is a deficient number, since it is larger than the sum of its proper divisors (1).

136706509 is an equidigital number, since it uses as much as digits as its factorization.

136706509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 136706509 is about 11692.1558747735. The cubic root of 136706509 is about 515.1452871895.

The spelling of 136706509 in words is "one hundred thirty-six million, seven hundred six thousand, five hundred nine".