55509943 has 4 divisors (see below), whose sum is σ = 55528128. Its totient is φ = 55491760.

The previous prime is 55509931. The next prime is 55509977. The reversal of 55509943 is 34990555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34990555 = 5 ⋅6998111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55509943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55509896 and 55509905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55509343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3271 + ... + 11032.

It is an arithmetic number, because the mean of its divisors is an integer number (13882032).

Almost surely, 2^55509943 is an apocalyptic number.

55509943 is a deficient number, since it is larger than the sum of its proper divisors (18185).

55509943 is a wasteful number, since it uses less digits than its factorization.

55509943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18184.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 55509943 is about 7450.4995134555. The cubic root of 55509943 is about 381.4669589084.

The spelling of 55509943 in words is "fifty-five million, five hundred nine thousand, nine hundred forty-three".