55445 has 8 divisors (see below), whose sum is σ = 71736. Its totient is φ = 40896.

The previous prime is 55441. The next prime is 55457. The reversal of 55445 is 54455.

55445 = 166² + 167².

55445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1156 + 54289 = 34^2 + 233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55445 - 2² = 55441 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362 + ... + 491.

It is an arithmetic number, because the mean of its divisors is an integer number (8967).

2⁵⁵⁴⁴⁵ is an apocalyptic number.

55445 is the 167-th centered square number.

It is an amenable number.

55445 is a deficient number, since it is larger than the sum of its proper divisors (16291).

55445 is a wasteful number, since it uses less digits than its factorization.

55445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871.

The product of its digits is 2000, while the sum is 23.

The square root of 55445 is about 235.4676198546. The cubic root of 55445 is about 38.1318137065.

Subtracting from 55445 its reverse (54455), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 5 and 5445, that multiplied together give a square (27225 = 165²).

The spelling of 55445 in words is "fifty-five thousand, four hundred forty-five".