515665013 has 4 divisors (see below), whose sum is σ = 516991020. Its totient is φ = 514339008.

The previous prime is 515665009. The next prime is 515665019. The reversal of 515665013 is 310566515.

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 50098084 + 465566929 = 7078^2 + 21577^2 .

It is a cyclic number.

It is not a de Polignac number, because 515665013 - 2² = 515665009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515665019) 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, 662420 + ... + 663197.

It is an arithmetic number, because the mean of its divisors is an integer number (129247755).

Almost surely, 2^515665013 is an apocalyptic number.

It is an amenable number.

515665013 is a deficient number, since it is larger than the sum of its proper divisors (1326007).

515665013 is a wasteful number, since it uses less digits than its factorization.

515665013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326006.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 515665013 is about 22708.2586959018. The cubic root of 515665013 is about 801.9043242770.

The spelling of 515665013 in words is "five hundred fifteen million, six hundred sixty-five thousand, thirteen".