520071649 has 4 divisors (see below), whose sum is σ = 520495360. Its totient is φ = 519647940.

The previous prime is 520071641. The next prime is 520071661. The reversal of 520071649 is 946170025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520071649 - 2³ = 520071641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520071641) 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, 210009 + ... + 212470.

It is an arithmetic number, because the mean of its divisors is an integer number (130123840).

Almost surely, 2^520071649 is an apocalyptic number.

It is an amenable number.

520071649 is a deficient number, since it is larger than the sum of its proper divisors (423711).

520071649 is a wasteful number, since it uses less digits than its factorization.

520071649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423710.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 520071649 is about 22805.0794561212. The cubic root of 520071649 is about 804.1820834806.

The spelling of 520071649 in words is "five hundred twenty million, seventy-one thousand, six hundred forty-nine".