520021801 has 8 divisors (see below), whose sum is σ = 563379264. Its totient is φ = 477143760.

The previous prime is 520021793. The next prime is 520021829. The reversal of 520021801 is 108120025.

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 520021801 - 2³ = 520021793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520021841) 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, 117595 + ... + 121936.

It is an arithmetic number, because the mean of its divisors is an integer number (70422408).

Almost surely, 2^520021801 is an apocalyptic number.

It is an amenable number.

520021801 is a deficient number, since it is larger than the sum of its proper divisors (43357463).

520021801 is a wasteful number, since it uses less digits than its factorization.

520021801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239711.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 520021801 is about 22803.9865155196. The cubic root of 520021801 is about 804.1563894893.

Adding to 520021801 its reverse (108120025), we get a palindrome (628141826).

The spelling of 520021801 in words is "five hundred twenty million, twenty-one thousand, eight hundred one".