136268681 has 2 divisors, whose sum is σ = 136268682. Its totient is φ = 136268680.

The previous prime is 136268663. The next prime is 136268683. The reversal of 136268681 is 186862631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135932281 + 336400 = 11659^2 + 580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136268681 is a prime.

It is a super-2 number, since 2×136268681² = 37138306842959522, which contains 22 as substring.

Together with 136268683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136268683) 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, 68134340 + 68134341.

It is an arithmetic number, because the mean of its divisors is an integer number (68134341).

Almost surely, 2^136268681 is an apocalyptic number.

It is an amenable number.

136268681 is a deficient number, since it is larger than the sum of its proper divisors (1).

136268681 is an equidigital number, since it uses as much as digits as its factorization.

136268681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 136268681 is about 11673.4177086233. The cubic root of 136268681 is about 514.5947495326.

The spelling of 136268681 in words is "one hundred thirty-six million, two hundred sixty-eight thousand, six hundred eighty-one".