18149543 has 2 divisors, whose sum is σ = 18149544. Its totient is φ = 18149542.

The previous prime is 18149531. The next prime is 18149581. The reversal of 18149543 is 34594181.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18149543 is a prime.

It is a super-2 number, since 2×18149543² = 658811822217698, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18149743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9074771 + 9074772.

It is an arithmetic number, because the mean of its divisors is an integer number (9074772).

Almost surely, 2^18149543 is an apocalyptic number.

18149543 is a deficient number, since it is larger than the sum of its proper divisors (1).

18149543 is an equidigital number, since it uses as much as digits as its factorization.

18149543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 18149543 is about 4260.2280455393. The cubic root of 18149543 is about 262.7979045693.

The spelling of 18149543 in words is "eighteen million, one hundred forty-nine thousand, five hundred forty-three".