515881 has 4 divisors (see below), whose sum is σ = 533700. Its totient is φ = 498064.

The previous prime is 515873. The next prime is 515887. The reversal of 515881 is 188515.

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 416025 + 99856 = 645^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 515881 - 2³ = 515873 is a prime.

It is a super-2 number, since 2×515881² = 532266412322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (515887) 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, 8866 + ... + 8923.

It is an arithmetic number, because the mean of its divisors is an integer number (133425).

2⁵¹⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

515881 is a deficient number, since it is larger than the sum of its proper divisors (17819).

515881 is a wasteful number, since it uses less digits than its factorization.

515881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17818.

The product of its digits is 1600, while the sum is 28.

The square root of 515881 is about 718.2485642172. The cubic root of 515881 is about 80.2016268226.

The spelling of 515881 in words is "five hundred fifteen thousand, eight hundred eighty-one".