513647 has 4 divisors (see below), whose sum is σ = 516120. Its totient is φ = 511176.

The previous prime is 513641. The next prime is 513649. The reversal of 513647 is 746315.

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

It is a cyclic number.

It is not a de Polignac number, because 513647 - 2⁴ = 513631 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 (513641) 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, 893 + ... + 1350.

It is an arithmetic number, because the mean of its divisors is an integer number (129030).

2⁵¹³⁶⁴⁷ is an apocalyptic number.

513647 is a deficient number, since it is larger than the sum of its proper divisors (2473).

513647 is a wasteful number, since it uses less digits than its factorization.

513647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472.

The product of its digits is 2520, while the sum is 26.

The square root of 513647 is about 716.6917049890. The cubic root of 513647 is about 80.0856894337.

The spelling of 513647 in words is "five hundred thirteen thousand, six hundred forty-seven".