135143213 has 4 divisors (see below), whose sum is σ = 136536540. Its totient is φ = 133749888.

The previous prime is 135143191. The next prime is 135143227. The reversal of 135143213 is 312341531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312341531 = 37 ⋅8441663.

It can be written as a sum of positive squares in 2 ways, for example, as 22401289 + 112741924 = 4733^2 + 10618^2 .

It is a cyclic number.

It is not a de Polignac number, because 135143213 - 2²⁶ = 68034349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135143233) 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 in 3 ways as a sum of consecutive naturals, for example, 696518 + ... + 696711.

It is an arithmetic number, because the mean of its divisors is an integer number (34134135).

Almost surely, 2^135143213 is an apocalyptic number.

It is an amenable number.

135143213 is a deficient number, since it is larger than the sum of its proper divisors (1393327).

135143213 is an equidigital number, since it uses as much as digits as its factorization.

135143213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393326.

The product of its digits is 1080, while the sum is 23.

The square root of 135143213 is about 11625.1113112950. Note that the first 3 decimals coincide. The cubic root of 135143213 is about 513.1741204770.

Adding to 135143213 its reverse (312341531), we get a palindrome (447484744).

The spelling of 135143213 in words is "one hundred thirty-five million, one hundred forty-three thousand, two hundred thirteen".