654421543 has 4 divisors (see below), whose sum is σ = 662705440. Its totient is φ = 646137648.

The previous prime is 654421531. The next prime is 654421571. The reversal of 654421543 is 345124456.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654421543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 654421499 and 654421508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654421513) 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, 4141830 + ... + 4141987.

It is an arithmetic number, because the mean of its divisors is an integer number (165676360).

Almost surely, 2^654421543 is an apocalyptic number.

654421543 is a deficient number, since it is larger than the sum of its proper divisors (8283897).

654421543 is an equidigital number, since it uses as much as digits as its factorization.

654421543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8283896.

The product of its digits is 57600, while the sum is 34.

The square root of 654421543 is about 25581.6641952786. The cubic root of 654421543 is about 868.1988291887.

Adding to 654421543 its reverse (345124456), we get a palindrome (999545999).

The spelling of 654421543 in words is "six hundred fifty-four million, four hundred twenty-one thousand, five hundred forty-three".