501640543 has 4 divisors (see below), whose sum is σ = 517822528. Its totient is φ = 485458560.

The previous prime is 501640523. The next prime is 501640547. The reversal of 501640543 is 345046105.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345046105 = 5 ⋅69009221.

It is a cyclic number.

It is not a de Polignac number, because 501640543 - 2²⁵ = 468086111 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 (501640547) 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, 8090946 + ... + 8091007.

It is an arithmetic number, because the mean of its divisors is an integer number (129455632).

Almost surely, 2^501640543 is an apocalyptic number.

501640543 is a deficient number, since it is larger than the sum of its proper divisors (16181985).

501640543 is a wasteful number, since it uses less digits than its factorization.

501640543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16181984.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 501640543 is about 22397.3333903838. Note that the first 4 decimals coincide. The cubic root of 501640543 is about 794.5676448719.

Adding to 501640543 its reverse (345046105), we get a palindrome (846686648).

The spelling of 501640543 in words is "five hundred one million, six hundred forty thousand, five hundred forty-three".