135215239 has 2 divisors, whose sum is σ = 135215240. Its totient is φ = 135215238.

The previous prime is 135215237. The next prime is 135215261. The reversal of 135215239 is 932512531.

It is a weak prime.

It is an emirp because it is prime and its reverse (932512531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135215239 - 2¹ = 135215237 is a prime.

Together with 135215237, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 135215239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135215231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67607619 + 67607620.

It is an arithmetic number, because the mean of its divisors is an integer number (67607620).

Almost surely, 2^135215239 is an apocalyptic number.

135215239 is a deficient number, since it is larger than the sum of its proper divisors (1).

135215239 is an equidigital number, since it uses as much as digits as its factorization.

135215239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 31.

The square root of 135215239 is about 11628.2087614559. The cubic root of 135215239 is about 513.2652714713.

The spelling of 135215239 in words is "one hundred thirty-five million, two hundred fifteen thousand, two hundred thirty-nine".