420541543 has 2 divisors, whose sum is σ = 420541544. Its totient is φ = 420541542.

The previous prime is 420541523. The next prime is 420541549. The reversal of 420541543 is 345145024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420541543 is a prime.

It is equal to p_22371742 and since 420541543 and 22371742 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420541549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210270771 + 210270772.

It is an arithmetic number, because the mean of its divisors is an integer number (210270772).

Almost surely, 2^420541543 is an apocalyptic number.

420541543 is a deficient number, since it is larger than the sum of its proper divisors (1).

420541543 is an equidigital number, since it uses as much as digits as its factorization.

420541543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 420541543 is about 20507.1095720484. The cubic root of 420541543 is about 749.2089692464.

Adding to 420541543 its reverse (345145024), we get a palindrome (765686567).

The spelling of 420541543 in words is "four hundred twenty million, five hundred forty-one thousand, five hundred forty-three".