513684643 has 4 divisors (see below), whose sum is σ = 513949888. Its totient is φ = 513419400.

The previous prime is 513684641. The next prime is 513684671. The reversal of 513684643 is 346486315.

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 513684643 - 2¹ = 513684641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 513684596 and 513684605.

It is not an unprimeable number, because it can be changed into a prime (513684641) 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, 129696 + ... + 133597.

It is an arithmetic number, because the mean of its divisors is an integer number (128487472).

Almost surely, 2^513684643 is an apocalyptic number.

513684643 is a deficient number, since it is larger than the sum of its proper divisors (265245).

513684643 is a wasteful number, since it uses less digits than its factorization.

513684643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265244.

The product of its digits is 207360, while the sum is 40.

The square root of 513684643 is about 22664.6121299262. The cubic root of 513684643 is about 800.8764576560.

The spelling of 513684643 in words is "five hundred thirteen million, six hundred eighty-four thousand, six hundred forty-three".