135311243 has 4 divisors (see below), whose sum is σ = 135341640. Its totient is φ = 135280848.

The previous prime is 135311213. The next prime is 135311263. The reversal of 135311243 is 342113531.

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 135311243 - 2¹⁸ = 135049099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135311213) 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, 7073 + ... + 17906.

It is an arithmetic number, because the mean of its divisors is an integer number (33835410).

Almost surely, 2^135311243 is an apocalyptic number.

135311243 is a deficient number, since it is larger than the sum of its proper divisors (30397).

135311243 is an equidigital number, since it uses as much as digits as its factorization.

135311243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30396.

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

The square root of 135311243 is about 11632.3360938377. The cubic root of 135311243 is about 513.3867170078.

Adding to 135311243 its reverse (342113531), we get a palindrome (477424774).

The spelling of 135311243 in words is "one hundred thirty-five million, three hundred eleven thousand, two hundred forty-three".