135256213 has 2 divisors, whose sum is σ = 135256214. Its totient is φ = 135256212.

The previous prime is 135256211. The next prime is 135256217. The reversal of 135256213 is 312652531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125283249 + 9972964 = 11193^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 135256213 - 2¹ = 135256211 is a prime.

Together with 135256211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135256211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67628106 + 67628107.

It is an arithmetic number, because the mean of its divisors is an integer number (67628107).

Almost surely, 2^135256213 is an apocalyptic number.

It is an amenable number.

135256213 is a deficient number, since it is larger than the sum of its proper divisors (1).

135256213 is an equidigital number, since it uses as much as digits as its factorization.

135256213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 135256213 is about 11629.9704642789. The cubic root of 135256213 is about 513.3171108140.

The spelling of 135256213 in words is "one hundred thirty-five million, two hundred fifty-six thousand, two hundred thirteen".