505545 has 8 divisors (see below), whose sum is σ = 808896. Its totient is φ = 269616.

The previous prime is 505537. The next prime is 505559. The reversal of 505545 is 545505.

505545 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 505545 - 2³ = 505537 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

505545 is strictly pandigital in base 7.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16837 + ... + 16866.

It is an arithmetic number, because the mean of its divisors is an integer number (101112).

2⁵⁰⁵⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

505545 is a deficient number, since it is larger than the sum of its proper divisors (303351).

505545 is a wasteful number, since it uses less digits than its factorization.

505545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33711.

The product of its (nonzero) digits is 2500, while the sum is 24.

The square root of 505545 is about 711.0168774368. The cubic root of 505545 is about 79.6623792405.

Subtracting from 505545 its sum of digits (24), we obtain a square (505521 = 711²).

It can be divided in two parts, 5055 and 45, that multiplied together give a triangular number (227475 = T₆₇₄).

The spelling of 505545 in words is "five hundred five thousand, five hundred forty-five".