18061543 has 2 divisors, whose sum is σ = 18061544. Its totient is φ = 18061542.

The previous prime is 18061529. The next prime is 18061567. The reversal of 18061543 is 34516081.

It is a weak prime.

It is an emirp because it is prime and its reverse (34516081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18061543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18061523) 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 as a sum of consecutive naturals, namely, 9030771 + 9030772.

It is an arithmetic number, because the mean of its divisors is an integer number (9030772).

Almost surely, 2^18061543 is an apocalyptic number.

18061543 is a deficient number, since it is larger than the sum of its proper divisors (1).

18061543 is an equidigital number, since it uses as much as digits as its factorization.

18061543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 18061543 is about 4249.8874102734. The cubic root of 18061543 is about 262.3724816767.

The spelling of 18061543 in words is "eighteen million, sixty-one thousand, five hundred forty-three".