55129443 has 4 divisors (see below), whose sum is σ = 73505928. Its totient is φ = 36752960.

The previous prime is 55129433. The next prime is 55129457. The reversal of 55129443 is 34492155.

55129443 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 a cyclic number.

It is not a de Polignac number, because 55129443 - 2⁴ = 55129427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55129433) 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, 9188238 + ... + 9188243.

It is an arithmetic number, because the mean of its divisors is an integer number (18376482).

Almost surely, 2^55129443 is an apocalyptic number.

55129443 is a deficient number, since it is larger than the sum of its proper divisors (18376485).

55129443 is a wasteful number, since it uses less digits than its factorization.

55129443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18376484.

The product of its digits is 21600, while the sum is 33.

The square root of 55129443 is about 7424.9204036138. The cubic root of 55129443 is about 380.5933551038.

The spelling of 55129443 in words is "fifty-five million, one hundred twenty-nine thousand, four hundred forty-three".