515565 has 40 divisors (see below), whose sum is σ = 987360. Its totient is φ = 256608.

The previous prime is 515563. The next prime is 515579. The reversal of 515565 is 565515.

It is not a de Polignac number, because 515565 - 2¹ = 515563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

515565 is a lucky 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 (515563) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7662 + ... + 7728.

It is an arithmetic number, because the mean of its divisors is an integer number (24684).

2⁵¹⁵⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

515565 is a deficient number, since it is larger than the sum of its proper divisors (471795).

515565 is a wasteful number, since it uses less digits than its factorization.

515565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 94 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 515565 is about 718.0285509644. The cubic root of 515565 is about 80.1852477929.

The spelling of 515565 in words is "five hundred fifteen thousand, five hundred sixty-five".