3661543 has 2 divisors, whose sum is σ = 3661544. Its totient is φ = 3661542.

The previous prime is 3661529. The next prime is 3661561. The reversal of 3661543 is 3451663.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3661543 is a prime.

It is a super-3 number, since 3×3661543³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3661573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1830771 + 1830772.

It is an arithmetic number, because the mean of its divisors is an integer number (1830772).

Almost surely, 2^3661543 is an apocalyptic number.

3661543 is a deficient number, since it is larger than the sum of its proper divisors (1).

3661543 is an equidigital number, since it uses as much as digits as its factorization.

3661543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 28.

The square root of 3661543 is about 1913.5158739869. The cubic root of 3661543 is about 154.1303079911.

The spelling of 3661543 in words is "three million, six hundred sixty-one thousand, five hundred forty-three".