231540543 has 24 divisors (see below), whose sum is σ = 365562288. Its totient is φ = 140355072.

The previous prime is 231540523. The next prime is 231540557. The reversal of 231540543 is 345045132.

It is not a de Polignac number, because 231540543 - 2⁵ = 231540511 is a prime.

It is a super-2 number, since 2×231540543² = 107222046105469698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231540523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6930 + ... + 22607.

It is an arithmetic number, because the mean of its divisors is an integer number (15231762).

Almost surely, 2^231540543 is an apocalyptic number.

231540543 is a deficient number, since it is larger than the sum of its proper divisors (134021745).

231540543 is a wasteful number, since it uses less digits than its factorization.

231540543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29623 (or 29620 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 231540543 is about 15216.4563220219. The cubic root of 231540543 is about 614.0574656115.

Adding to 231540543 its reverse (345045132), we get a palindrome (576585675).

The spelling of 231540543 in words is "two hundred thirty-one million, five hundred forty thousand, five hundred forty-three".