520899909 has 4 divisors (see below), whose sum is σ = 694533216. Its totient is φ = 347266604.

The previous prime is 520899901. The next prime is 520899917. The reversal of 520899909 is 909998025.

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 an interprime number because it is at equal distance from previous prime (520899901) and next prime (520899917).

It is a cyclic number.

It is not a de Polignac number, because 520899909 - 2³ = 520899901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520899901) 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, 86816649 + ... + 86816654.

It is an arithmetic number, because the mean of its divisors is an integer number (173633304).

Almost surely, 2^520899909 is an apocalyptic number.

It is an amenable number.

520899909 is a deficient number, since it is larger than the sum of its proper divisors (173633307).

520899909 is a wasteful number, since it uses less digits than its factorization.

520899909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173633306.

The product of its (nonzero) digits is 524880, while the sum is 51.

The square root of 520899909 is about 22823.2317825500. The cubic root of 520899909 is about 804.6087673638.

The spelling of 520899909 in words is "five hundred twenty million, eight hundred ninety-nine thousand, nine hundred nine".