135120323243 has 4 divisors (see below), whose sum is σ = 136027171200. Its totient is φ = 134213475288.

The previous prime is 135120323209. The next prime is 135120323333. The reversal of 135120323243 is 342323021531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135120323243 - 2⁶ = 135120323179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135120323843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453423755 + ... + 453424052.

It is an arithmetic number, because the mean of its divisors is an integer number (34006792800).

Almost surely, 2^135120323243 is an apocalyptic number.

135120323243 is a deficient number, since it is larger than the sum of its proper divisors (906847957).

135120323243 is an equidigital number, since it uses as much as digits as its factorization.

135120323243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906847956.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 135120323243 its reverse (342323021531), we get a palindrome (477443344774).

The spelling of 135120323243 in words is "one hundred thirty-five billion, one hundred twenty million, three hundred twenty-three thousand, two hundred forty-three".