136239289 has 2 divisors, whose sum is σ = 136239290. Its totient is φ = 136239288.

The previous prime is 136239287. The next prime is 136239293. The reversal of 136239289 is 982932631.

136239289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118091689 + 18147600 = 10867^2 + 4260^2 .

It is a cyclic number.

It is not a de Polignac number, because 136239289 - 2¹ = 136239287 is a prime.

It is a super-2 number, since 2×136239289² = 37122287734451042, which contains 22 as substring.

Together with 136239287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (136239283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68119644 + 68119645.

It is an arithmetic number, because the mean of its divisors is an integer number (68119645).

Almost surely, 2^136239289 is an apocalyptic number.

It is an amenable number.

136239289 is a deficient number, since it is larger than the sum of its proper divisors (1).

136239289 is an equidigital number, since it uses as much as digits as its factorization.

136239289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 136239289 is about 11672.1587120806. The cubic root of 136239289 is about 514.5577489630.

The spelling of 136239289 in words is "one hundred thirty-six million, two hundred thirty-nine thousand, two hundred eighty-nine".