1020002543 has 16 divisors (see below), whose sum is σ = 1204471296. Its totient is φ = 845688480.

The previous prime is 1020002519. The next prime is 1020002563. The reversal of 1020002543 is 3452000201.

1020002543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1020002543 - 2²⁰ = 1018953967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020002563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6980 + ... + 45702.

It is an arithmetic number, because the mean of its divisors is an integer number (75279456).

Almost surely, 2^1020002543 is an apocalyptic number.

1020002543 is a deficient number, since it is larger than the sum of its proper divisors (184468753).

1020002543 is an equidigital number, since it uses as much as digits as its factorization.

1020002543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38854.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1020002543 is about 31937.4786575271. The cubic root of 1020002543 is about 1006.6235461089.

Adding to 1020002543 its reverse (3452000201), we get a palindrome (4472002744).

The spelling of 1020002543 in words is "one billion, twenty million, two thousand, five hundred forty-three".