136387129 has 2 divisors, whose sum is σ = 136387130. Its totient is φ = 136387128.

The previous prime is 136387127. The next prime is 136387151. The reversal of 136387129 is 921783631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131721529 + 4665600 = 11477^2 + 2160^2 .

It is a cyclic number.

It is not a de Polignac number, because 136387129 - 2¹ = 136387127 is a prime.

Together with 136387127, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 136387091 and 136387100.

It is not a weakly prime, because it can be changed into another prime (136387123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68193564 + 68193565.

It is an arithmetic number, because the mean of its divisors is an integer number (68193565).

Almost surely, 2^136387129 is an apocalyptic number.

It is an amenable number.

136387129 is a deficient number, since it is larger than the sum of its proper divisors (1).

136387129 is an equidigital number, since it uses as much as digits as its factorization.

136387129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 136387129 is about 11678.4900136961. The cubic root of 136387129 is about 514.7438057121.

The spelling of 136387129 in words is "one hundred thirty-six million, three hundred eighty-seven thousand, one hundred twenty-nine".