135123253051 has 4 divisors (see below), whose sum is σ = 139782675600. Its totient is φ = 130463830504.

The previous prime is 135123253049. The next prime is 135123253061. The reversal of 135123253051 is 150352321531.

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

It is not a de Polignac number, because 135123253051 - 2¹ = 135123253049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135123253061) 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, 2329711231 + ... + 2329711288.

It is an arithmetic number, because the mean of its divisors is an integer number (34945668900).

Almost surely, 2^135123253051 is an apocalyptic number.

135123253051 is a deficient number, since it is larger than the sum of its proper divisors (4659422549).

135123253051 is an equidigital number, since it uses as much as digits as its factorization.

135123253051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659422548.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 135123253051 its reverse (150352321531), we get a palindrome (285475574582).

The spelling of 135123253051 in words is "one hundred thirty-five billion, one hundred twenty-three million, two hundred fifty-three thousand, fifty-one".