505541 has 4 divisors (see below), whose sum is σ = 508032. Its totient is φ = 503052.

The previous prime is 505537. The next prime is 505559. The reversal of 505541 is 145505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 145505 = 5 ⋅29101.

It is a cyclic number.

It is not a de Polignac number, because 505541 - 2² = 505537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 505541.

It is not an unprimeable number, because it can be changed into a prime (505501) 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, 911 + ... + 1356.

It is an arithmetic number, because the mean of its divisors is an integer number (127008).

2⁵⁰⁵⁵⁴¹ is an apocalyptic number.

It is an amenable number.

505541 is a deficient number, since it is larger than the sum of its proper divisors (2491).

505541 is a wasteful number, since it uses less digits than its factorization.

505541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 505541 is about 711.0140645585. The cubic root of 505541 is about 79.6621691370.

Subtracting from 505541 its sum of digits (20), we obtain a square (505521 = 711²).

The spelling of 505541 in words is "five hundred five thousand, five hundred forty-one".