1001543 has 4 divisors (see below), whose sum is σ = 1004640. Its totient is φ = 998448.

The previous prime is 1001531. The next prime is 1001549. The reversal of 1001543 is 3451001.

1001543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3451001 = 269 ⋅12829.

It is a cyclic number.

It is not a de Polignac number, because 1001543 - 2⁴ = 1001527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998 + ... + 1731.

It is an arithmetic number, because the mean of its divisors is an integer number (251160).

2^1001543 is an apocalyptic number.

1001543 is a deficient number, since it is larger than the sum of its proper divisors (3097).

1001543 is an equidigital number, since it uses as much as digits as its factorization.

1001543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1001543 is about 1000.7712026233. The cubic root of 1001543 is about 100.0514069021.

Adding to 1001543 its reverse (3451001), we get a palindrome (4452544).

The spelling of 1001543 in words is "one million, one thousand, five hundred forty-three".