520821869 has 8 divisors (see below), whose sum is σ = 528103680. Its totient is φ = 513583056.

The previous prime is 520821839. The next prime is 520821881. The reversal of 520821869 is 968128025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 520821869 - 2¹⁶ = 520756333 is a prime.

It is a super-3 number, since 3×520821869³ (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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520821839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14039 + ... + 35195.

It is an arithmetic number, because the mean of its divisors is an integer number (66012960).

Almost surely, 2^520821869 is an apocalyptic number.

It is an amenable number.

520821869 is a deficient number, since it is larger than the sum of its proper divisors (7281811).

520821869 is a wasteful number, since it uses less digits than its factorization.

520821869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21499.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 520821869 is about 22821.5220570408. The cubic root of 520821869 is about 804.5685838256.

The spelling of 520821869 in words is "five hundred twenty million, eight hundred twenty-one thousand, eight hundred sixty-nine".