23531205543 has 4 divisors (see below), whose sum is σ = 31374940728. Its totient is φ = 15687470360.

The previous prime is 23531205497. The next prime is 23531205547. The reversal of 23531205543 is 34550213532.

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 23531205543 - 2²¹ = 23529108391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23531205547) 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, 3921867588 + ... + 3921867593.

It is an arithmetic number, because the mean of its divisors is an integer number (7843735182).

Almost surely, 2^23531205543 is an apocalyptic number.

23531205543 is a deficient number, since it is larger than the sum of its proper divisors (7843735185).

23531205543 is an equidigital number, since it uses as much as digits as its factorization.

23531205543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7843735184.

The product of its (nonzero) digits is 54000, while the sum is 33.

The spelling of 23531205543 in words is "twenty-three billion, five hundred thirty-one million, two hundred five thousand, five hundred forty-three".