136680121 has 2 divisors, whose sum is σ = 136680122. Its totient is φ = 136680120.

The previous prime is 136680043. The next prime is 136680133. The reversal of 136680121 is 121086631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122323600 + 14356521 = 11060^2 + 3789^2 .

It is a cyclic number.

It is not a de Polignac number, because 136680121 - 2⁷ = 136679993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136680121.

It is not a weakly prime, because it can be changed into another prime (136680151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68340060 + 68340061.

It is an arithmetic number, because the mean of its divisors is an integer number (68340061).

Almost surely, 2^136680121 is an apocalyptic number.

It is an amenable number.

136680121 is a deficient number, since it is larger than the sum of its proper divisors (1).

136680121 is an equidigital number, since it uses as much as digits as its factorization.

136680121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 136680121 is about 11691.0273714503. The cubic root of 136680121 is about 515.1121394663.

The spelling of 136680121 in words is "one hundred thirty-six million, six hundred eighty thousand, one hundred twenty-one".