515855 has 4 divisors (see below), whose sum is σ = 619032. Its totient is φ = 412680.

The previous prime is 515843. The next prime is 515857. The reversal of 515855 is 558515.

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

It is not a de Polignac number, because 515855 - 2⁴ = 515839 is a prime.

It is a super-2 number, since 2×515855² = 532212762050, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515857) 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, 51581 + ... + 51590.

It is an arithmetic number, because the mean of its divisors is an integer number (154758).

2⁵¹⁵⁸⁵⁵ is an apocalyptic number.

515855 is a deficient number, since it is larger than the sum of its proper divisors (103177).

515855 is a wasteful number, since it uses less digits than its factorization.

515855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103176.

The product of its digits is 5000, while the sum is 29.

The square root of 515855 is about 718.2304644054. The cubic root of 515855 is about 80.2002794334.

The spelling of 515855 in words is "five hundred fifteen thousand, eight hundred fifty-five".