135231251543 has 4 divisors (see below), whose sum is σ = 137448157368. Its totient is φ = 133014345720.

The previous prime is 135231251531. The next prime is 135231251581. The reversal of 135231251543 is 345152132531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345152132531 = 16607 ⋅20783533.

It is a cyclic number.

It is not a de Polignac number, because 135231251543 - 2¹⁶ = 135231186007 is a prime.

It is a super-2 number, since 2×135231251543² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135231257543) 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, 1108452821 + ... + 1108452942.

It is an arithmetic number, because the mean of its divisors is an integer number (34362039342).

Almost surely, 2^135231251543 is an apocalyptic number.

135231251543 is a deficient number, since it is larger than the sum of its proper divisors (2216905825).

135231251543 is an equidigital number, since it uses as much as digits as its factorization.

135231251543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216905824.

The product of its digits is 54000, while the sum is 35.

The spelling of 135231251543 in words is "one hundred thirty-five billion, two hundred thirty-one million, two hundred fifty-one thousand, five hundred forty-three".