506545 has 8 divisors (see below), whose sum is σ = 654696. Its totient is φ = 374016.

The previous prime is 506537. The next prime is 506551. The reversal of 506545 is 545605.

It can be written as a sum of positive squares in 4 ways, for example, as 91809 + 414736 = 303^2 + 644^2 .

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 506545 - 2³ = 506537 is a prime.

It is a Duffinian 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, 3832 + ... + 3961.

It is an arithmetic number, because the mean of its divisors is an integer number (81837).

2⁵⁰⁶⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

506545 is a deficient number, since it is larger than the sum of its proper divisors (148151).

506545 is a wasteful number, since it uses less digits than its factorization.

506545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7811.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 506545 is about 711.7197482155. The cubic root of 506545 is about 79.7148703878.

Adding to 506545 its product of nonzero digits (3000), we get a triangular number (509545 = T₁₀₀₉).

Subtracting 506545 from its reverse (545605), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 506545 in words is "five hundred six thousand, five hundred forty-five".