500561 has 4 divisors (see below), whose sum is σ = 507492. Its totient is φ = 493632.

The previous prime is 500527. The next prime is 500567. The reversal of 500561 is 165005.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102400 + 398161 = 320^2 + 631^2 .

It is a cyclic number.

It is not a de Polignac number, because 500561 - 2¹⁸ = 238417 is a prime.

It is a super-2 number, since 2×500561² = 501122629442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (500567) 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, 3356 + ... + 3501.

It is an arithmetic number, because the mean of its divisors is an integer number (126873).

2⁵⁰⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

500561 is a deficient number, since it is larger than the sum of its proper divisors (6931).

500561 is an equidigital number, since it uses as much as digits as its factorization.

500561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 500561 is about 707.5033568825. The cubic root of 500561 is about 79.3997259030.

Adding to 500561 its reverse (165005), we get a palindrome (665566).

The spelling of 500561 in words is "five hundred thousand, five hundred sixty-one".