135647689 has 2 divisors, whose sum is σ = 135647690. Its totient is φ = 135647688.

The previous prime is 135647623. The next prime is 135647693. The reversal of 135647689 is 986746531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114854089 + 20793600 = 10717^2 + 4560^2 .

It is an emirp because it is prime and its reverse (986746531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135647689 - 2²¹ = 133550537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135647389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67823844 + 67823845.

It is an arithmetic number, because the mean of its divisors is an integer number (67823845).

Almost surely, 2^135647689 is an apocalyptic number.

It is an amenable number.

135647689 is a deficient number, since it is larger than the sum of its proper divisors (1).

135647689 is an equidigital number, since it uses as much as digits as its factorization.

135647689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The square root of 135647689 is about 11646.7887848969. The cubic root of 135647689 is about 513.8118700142.

The spelling of 135647689 in words is "one hundred thirty-five million, six hundred forty-seven thousand, six hundred eighty-nine".