515665 has 8 divisors (see below), whose sum is σ = 623808. Its totient is φ = 409200.

The previous prime is 515663. The next prime is 515677. The reversal of 515665 is 566515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 515665 - 2¹ = 515663 is a prime.

It is a Duffinian number.

515665 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 (515663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414 + ... + 1096.

It is an arithmetic number, because the mean of its divisors is an integer number (77976).

2⁵¹⁵⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

515665 is a deficient number, since it is larger than the sum of its proper divisors (108143).

515665 is a wasteful number, since it uses less digits than its factorization.

515665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839.

The product of its digits is 4500, while the sum is 28.

The square root of 515665 is about 718.0981827021. The cubic root of 515665 is about 80.1904317538.

The spelling of 515665 in words is "five hundred fifteen thousand, six hundred sixty-five".