135643241 has 2 divisors, whose sum is σ = 135643242. Its totient is φ = 135643240.

The previous prime is 135643231. The next prime is 135643243. The reversal of 135643241 is 142346531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135233641 + 409600 = 11629^2 + 640^2 .

It is an emirp because it is prime and its reverse (142346531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135643241 - 2¹⁰ = 135642217 is a prime.

Together with 135643243, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135643243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67821620 + 67821621.

It is an arithmetic number, because the mean of its divisors is an integer number (67821621).

Almost surely, 2^135643241 is an apocalyptic number.

It is an amenable number.

135643241 is a deficient number, since it is larger than the sum of its proper divisors (1).

135643241 is an equidigital number, since it uses as much as digits as its factorization.

135643241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 135643241 is about 11646.5978294092. The cubic root of 135643241 is about 513.8062538473.

Adding to 135643241 its reverse (142346531), we get a palindrome (277989772).

The spelling of 135643241 in words is "one hundred thirty-five million, six hundred forty-three thousand, two hundred forty-one".