136866239 has 2 divisors, whose sum is σ = 136866240. Its totient is φ = 136866238.

The previous prime is 136866217. The next prime is 136866251. The reversal of 136866239 is 932668631.

136866239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (932668631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136866239 - 2⁸ = 136865983 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136866239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136866259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68433119 + 68433120.

It is an arithmetic number, because the mean of its divisors is an integer number (68433120).

Almost surely, 2^136866239 is an apocalyptic number.

136866239 is a deficient number, since it is larger than the sum of its proper divisors (1).

136866239 is an equidigital number, since it uses as much as digits as its factorization.

136866239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The square root of 136866239 is about 11698.9845285820. The cubic root of 136866239 is about 515.3458436730.

The spelling of 136866239 in words is "one hundred thirty-six million, eight hundred sixty-six thousand, two hundred thirty-nine".