55543861 has 2 divisors, whose sum is σ = 55543862. Its totient is φ = 55543860.

The previous prime is 55543853. The next prime is 55543877. The reversal of 55543861 is 16834555.

55543861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30041361 + 25502500 = 5481^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 55543861 - 2³ = 55543853 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55543861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55544861) 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, 27771930 + 27771931.

It is an arithmetic number, because the mean of its divisors is an integer number (27771931).

Almost surely, 2^55543861 is an apocalyptic number.

It is an amenable number.

55543861 is a deficient number, since it is larger than the sum of its proper divisors (1).

55543861 is an equidigital number, since it uses as much as digits as its factorization.

55543861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 37.

The square root of 55543861 is about 7452.7753890749. The cubic root of 55543861 is about 381.5446384570.

The spelling of 55543861 in words is "fifty-five million, five hundred forty-three thousand, eight hundred sixty-one".