55421543 has 2 divisors, whose sum is σ = 55421544. Its totient is φ = 55421542.

The previous prime is 55421533. The next prime is 55421551. The reversal of 55421543 is 34512455.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55421543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55421503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710771 + 27710772.

It is an arithmetic number, because the mean of its divisors is an integer number (27710772).

Almost surely, 2^55421543 is an apocalyptic number.

55421543 is a deficient number, since it is larger than the sum of its proper divisors (1).

55421543 is an equidigital number, since it uses as much as digits as its factorization.

55421543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 29.

The square root of 55421543 is about 7444.5646615501. The cubic root of 55421543 is about 381.2643549912.

Adding to 55421543 its reverse (34512455), we get a palindrome (89933998).

The spelling of 55421543 in words is "fifty-five million, four hundred twenty-one thousand, five hundred forty-three".