506339681 has 4 divisors (see below), whose sum is σ = 523799700. Its totient is φ = 488879664.

The previous prime is 506339653. The next prime is 506339699. The reversal of 506339681 is 186933605.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186933605 = 5 ⋅37386721.

It can be written as a sum of positive squares in 2 ways, for example, as 408646225 + 97693456 = 20215^2 + 9884^2 .

It is a cyclic number.

It is not a de Polignac number, because 506339681 - 2¹⁴ = 506323297 is a prime.

It is a super-2 number, since 2×506339681² = 512759745110363522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506339621) 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, 8729966 + ... + 8730023.

It is an arithmetic number, because the mean of its divisors is an integer number (130949925).

Almost surely, 2^506339681 is an apocalyptic number.

It is an amenable number.

506339681 is a deficient number, since it is larger than the sum of its proper divisors (17460019).

506339681 is a wasteful number, since it uses less digits than its factorization.

506339681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17460018.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 506339681 is about 22501.9928228590. The cubic root of 506339681 is about 797.0409859765.

It can be divided in two parts, 5063 and 39681, that added together give a palindrome (44744).

The spelling of 506339681 in words is "five hundred six million, three hundred thirty-nine thousand, six hundred eighty-one".