136813657 has 2 divisors, whose sum is σ = 136813658. Its totient is φ = 136813656.

The previous prime is 136813627. The next prime is 136813681. The reversal of 136813657 is 756318631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100380361 + 36433296 = 10019^2 + 6036^2 .

It is an emirp because it is prime and its reverse (756318631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136813657 - 2¹⁹ = 136289369 is a prime.

It is not a weakly prime, because it can be changed into another prime (136813627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68406828 + 68406829.

It is an arithmetic number, because the mean of its divisors is an integer number (68406829).

Almost surely, 2^136813657 is an apocalyptic number.

It is an amenable number.

136813657 is a deficient number, since it is larger than the sum of its proper divisors (1).

136813657 is an equidigital number, since it uses as much as digits as its factorization.

136813657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 136813657 is about 11696.7370236318. The cubic root of 136813657 is about 515.2798391168.

The spelling of 136813657 in words is "one hundred thirty-six million, eight hundred thirteen thousand, six hundred fifty-seven".