51355543 has 2 divisors, whose sum is σ = 51355544. Its totient is φ = 51355542.

The previous prime is 51355541. The next prime is 51355559. The reversal of 51355543 is 34555315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51355543 - 2¹ = 51355541 is a prime.

Together with 51355541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51355541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25677771 + 25677772.

It is an arithmetic number, because the mean of its divisors is an integer number (25677772).

Almost surely, 2^51355543 is an apocalyptic number.

51355543 is a deficient number, since it is larger than the sum of its proper divisors (1).

51355543 is an equidigital number, since it uses as much as digits as its factorization.

51355543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22500, while the sum is 31.

The square root of 51355543 is about 7166.2781832692. The cubic root of 51355543 is about 371.7027508474.

The spelling of 51355543 in words is "fifty-one million, three hundred fifty-five thousand, five hundred forty-three".