1231423543 has 8 divisors (see below), whose sum is σ = 1490126112. Its totient is φ = 993417216.

The previous prime is 1231423511. The next prime is 1231423579. The reversal of 1231423543 is 3453241321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231423543 - 2⁵ = 1231423511 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 (1231420543) 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 7 ways as a sum of consecutive naturals, for example, 5173930 + ... + 5174167.

It is an arithmetic number, because the mean of its divisors is an integer number (186265764).

Almost surely, 2^1231423543 is an apocalyptic number.

1231423543 is a deficient number, since it is larger than the sum of its proper divisors (258702569).

1231423543 is a wasteful number, since it uses less digits than its factorization.

1231423543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10348121.

The product of its digits is 8640, while the sum is 28.

The square root of 1231423543 is about 35091.6449172734. The cubic root of 1231423543 is about 1071.8544552418.

Adding to 1231423543 its reverse (3453241321), we get a palindrome (4684664864).

The spelling of 1231423543 in words is "one billion, two hundred thirty-one million, four hundred twenty-three thousand, five hundred forty-three".