136609657 has 2 divisors, whose sum is σ = 136609658. Its totient is φ = 136609656.

The previous prime is 136609651. The next prime is 136609679. The reversal of 136609657 is 756906631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126247696 + 10361961 = 11236^2 + 3219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136609657 is a prime.

It is not a weakly prime, because it can be changed into another prime (136609651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68304828 + 68304829.

It is an arithmetic number, because the mean of its divisors is an integer number (68304829).

Almost surely, 2^136609657 is an apocalyptic number.

It is an amenable number.

136609657 is a deficient number, since it is larger than the sum of its proper divisors (1).

136609657 is an equidigital number, since it uses as much as digits as its factorization.

136609657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 136609657 is about 11688.0133897938. The cubic root of 136609657 is about 515.0236040333.

The spelling of 136609657 in words is "one hundred thirty-six million, six hundred nine thousand, six hundred fifty-seven".