543400621 has 2 divisors, whose sum is σ = 543400622. Its totient is φ = 543400620.

The previous prime is 543400603. The next prime is 543400633. The reversal of 543400621 is 126004345.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543356100 + 44521 = 23310^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 543400621 - 2¹¹ = 543398573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (543400651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271700310 + 271700311.

It is an arithmetic number, because the mean of its divisors is an integer number (271700311).

Almost surely, 2^543400621 is an apocalyptic number.

It is an amenable number.

543400621 is a deficient number, since it is larger than the sum of its proper divisors (1).

543400621 is an equidigital number, since it uses as much as digits as its factorization.

543400621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 543400621 is about 23310.9549568438. The cubic root of 543400621 is about 816.0310991327.

Adding to 543400621 its reverse (126004345), we get a palindrome (669404966).

The spelling of 543400621 in words is "five hundred forty-three million, four hundred thousand, six hundred twenty-one".