23551543 has 4 divisors (see below), whose sum is σ = 23635048. Its totient is φ = 23468040.

The previous prime is 23551531. The next prime is 23551601. The reversal of 23551543 is 34515532.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23551543 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 (23551043) 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, 41328 + ... + 41893.

It is an arithmetic number, because the mean of its divisors is an integer number (5908762).

Almost surely, 2^23551543 is an apocalyptic number.

23551543 is a deficient number, since it is larger than the sum of its proper divisors (83505).

23551543 is an equidigital number, since it uses as much as digits as its factorization.

23551543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83504.

The product of its digits is 9000, while the sum is 28.

The square root of 23551543 is about 4852.9932000777. The cubic root of 23551543 is about 286.6419756692.

The spelling of 23551543 in words is "twenty-three million, five hundred fifty-one thousand, five hundred forty-three".