543551 has 2 divisors, whose sum is σ = 543552. Its totient is φ = 543550.

The previous prime is 543539. The next prime is 543553. The reversal of 543551 is 155345.

Added to its reverse (155345) it gives a square (698896 = 836²).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-543551 is a prime.

Together with 543553, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₄₄₈₄₃ and since 543551 and 44843 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (543553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271775 + 271776.

It is an arithmetic number, because the mean of its divisors is an integer number (271776).

2⁵⁴³⁵⁵¹ is an apocalyptic number.

543551 is a deficient number, since it is larger than the sum of its proper divisors (1).

543551 is an equidigital number, since it uses as much as digits as its factorization.

543551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 23.

The square root of 543551 is about 737.2591132024. The cubic root of 543551 is about 81.6106367494.

Adding to 543551 its reverse (155345), we get a palindrome (698896).

The spelling of 543551 in words is "five hundred forty-three thousand, five hundred fifty-one".