515 has 4 divisors (see below), whose sum is σ = 624. Its totient is φ = 408.

The previous prime is 509. The next prime is 521.

515 = T₁₀ + T₁₁ + ... + T₁₅.

515 is nontrivially palindromic in base 10.

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

It is an interprime number because it is at equal distance from previous prime (509) and next prime (521).

It is a cyclic number.

It is not a de Polignac number, because 515 - 2⁴ = 499 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

515 is an undulating number in base 10.

515 is a modest number, since divided by 15 gives 5 as remainder.

It is a plaindrome in base 7, base 12, base 14 and base 15.

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 496 and 505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47 + ... + 56.

It is an arithmetic number, because the mean of its divisors is an integer number (156).

515 is a deficient number, since it is larger than the sum of its proper divisors (109).

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

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

The sum of its prime factors is 108.

The product of its digits is 25, while the sum is 11.

The square root of 515 is about 22.6936114358. The cubic root of 515 is about 8.0155945814.

Multiplying 515 by its sum of digits (11), we get a palindrome (5665).

The spelling of 515 in words is "five hundred fifteen", and thus it is an aban number and an oban number.