506681 has 4 divisors (see below), whose sum is σ = 579072. Its totient is φ = 434292.

The previous prime is 506663. The next prime is 506683. The reversal of 506681 is 186605.

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: 186605 = 5 ⋅37321.

It is a cyclic number.

It is not a de Polignac number, because 506681 - 2¹⁰ = 505657 is a prime.

It is a super-2 number, since 2×506681² = 513451271522, which contains 22 as substring.

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 506681.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 506681.

It is not an unprimeable number, because it can be changed into a prime (506683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36185 + ... + 36198.

It is an arithmetic number, because the mean of its divisors is an integer number (144768).

2⁵⁰⁶⁶⁸¹ is an apocalyptic number.

It is an amenable number.

506681 is a deficient number, since it is larger than the sum of its proper divisors (72391).

506681 is an equidigital number, since it uses as much as digits as its factorization.

506681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72390.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 506681 is about 711.8152850284. The cubic root of 506681 is about 79.7220038457.

The spelling of 506681 in words is "five hundred six thousand, six hundred eighty-one".