18545543 has 2 divisors, whose sum is σ = 18545544. Its totient is φ = 18545542.

The previous prime is 18545537. The next prime is 18545591. The reversal of 18545543 is 34554581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18545543 - 2⁶ = 18545479 is a prime.

It is a Chen prime.

It is equal to p_1183868 and since 18545543 and 1183868 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18545503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9272771 + 9272772.

It is an arithmetic number, because the mean of its divisors is an integer number (9272772).

Almost surely, 2^18545543 is an apocalyptic number.

18545543 is a deficient number, since it is larger than the sum of its proper divisors (1).

18545543 is an equidigital number, since it uses as much as digits as its factorization.

18545543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48000, while the sum is 35.

The square root of 18545543 is about 4306.4536454024. The cubic root of 18545543 is about 264.6954755134.

The spelling of 18545543 in words is "eighteen million, five hundred forty-five thousand, five hundred forty-three".