1001142543 has 4 divisors (see below), whose sum is σ = 1334856728. Its totient is φ = 667428360.

The previous prime is 1001142521. The next prime is 1001142557. The reversal of 1001142543 is 3452411001.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1001142543 - 2⁵ = 1001142511 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 (1001142343) 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 in 3 ways as a sum of consecutive naturals, for example, 166857088 + ... + 166857093.

It is an arithmetic number, because the mean of its divisors is an integer number (333714182).

Almost surely, 2^1001142543 is an apocalyptic number.

1001142543 is a deficient number, since it is larger than the sum of its proper divisors (333714185).

1001142543 is an equidigital number, since it uses as much as digits as its factorization.

1001142543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333714184.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1001142543 is about 31640.8366355885. The cubic root of 1001142543 is about 1000.3807027137.

Adding to 1001142543 its reverse (3452411001), we get a palindrome (4453553544).

The spelling of 1001142543 in words is "one billion, one million, one hundred forty-two thousand, five hundred forty-three".