55643943 has 4 divisors (see below), whose sum is σ = 74191928. Its totient is φ = 37095960.

The previous prime is 55643933. The next prime is 55643981. The reversal of 55643943 is 34934655.

55643943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55643943 - 2¹³ = 55635751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55643933) 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 in 3 ways as a sum of consecutive naturals, for example, 9273988 + ... + 9273993.

It is an arithmetic number, because the mean of its divisors is an integer number (18547982).

Almost surely, 2^55643943 is an apocalyptic number.

55643943 is a deficient number, since it is larger than the sum of its proper divisors (18547985).

55643943 is a wasteful number, since it uses less digits than its factorization.

55643943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18547984.

The product of its digits is 194400, while the sum is 39.

The square root of 55643943 is about 7459.4867785927. The cubic root of 55643943 is about 381.7736636975.

The spelling of 55643943 in words is "fifty-five million, six hundred forty-three thousand, nine hundred forty-three".