520509969 has 80 divisors (see below), whose sum is σ = 935490688. Its totient is φ = 282175488.

The previous prime is 520509967. The next prime is 520509973. The reversal of 520509969 is 969905025.

520509969 is a `hidden beast` number, since 52 + 0 + 509 + 96 + 9 = 666.

It is not a de Polignac number, because 520509969 - 2¹ = 520509967 is a prime.

It is a super-3 number, since 3×520509969³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520509967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 901809 + ... + 902385.

Almost surely, 2^520509969 is an apocalyptic number.

It is an amenable number.

520509969 is a deficient number, since it is larger than the sum of its proper divisors (414980719).

520509969 is a wasteful number, since it uses less digits than its factorization.

520509969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The square root of 520509969 is about 22814.6875718253. The cubic root of 520509969 is about 804.4079434565.

The spelling of 520509969 in words is "five hundred twenty million, five hundred nine thousand, nine hundred sixty-nine".