1543543 has 2 divisors, whose sum is σ = 1543544. Its totient is φ = 1543542.

The previous prime is 1543537. The next prime is 1543559. The reversal of 1543543 is 3453451.

It is a weak prime.

It is an emirp because it is prime and its reverse (3453451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1543543 - 2⁵ = 1543511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1543513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771771 + 771772.

It is an arithmetic number, because the mean of its divisors is an integer number (771772).

2^1543543 is an apocalyptic number.

1543543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543543 is an equidigital number, since it uses as much as digits as its factorization.

1543543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 25.

The square root of 1543543 is about 1242.3940598699. The cubic root of 1543543 is about 115.5685268901.

Adding to 1543543 its reverse (3453451), we get a palindrome (4996994).

The spelling of 1543543 in words is "one million, five hundred forty-three thousand, five hundred forty-three".