520071647 has 4 divisors (see below), whose sum is σ = 521909640. Its totient is φ = 518233656.

The previous prime is 520071641. The next prime is 520071661. The reversal of 520071647 is 746170025.

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 520071647 - 2⁴ = 520071631 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 (520071641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918572 + ... + 919137.

It is an arithmetic number, because the mean of its divisors is an integer number (130477410).

Almost surely, 2^520071647 is an apocalyptic number.

520071647 is a deficient number, since it is larger than the sum of its proper divisors (1837993).

520071647 is a wasteful number, since it uses less digits than its factorization.

520071647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837992.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 520071647 is about 22805.0794122713. The cubic root of 520071647 is about 804.1820824497.

The spelling of 520071647 in words is "five hundred twenty million, seventy-one thousand, six hundred forty-seven".