520221261 has 32 divisors (see below), whose sum is σ = 824320000. Its totient is φ = 285560640.

The previous prime is 520221253. The next prime is 520221263. The reversal of 520221261 is 162122025.

It is a happy number.

It is not a de Polignac number, because 520221261 - 2³ = 520221253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520221263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87615 + ... + 93363.

It is an arithmetic number, because the mean of its divisors is an integer number (25760000).

Almost surely, 2^520221261 is an apocalyptic number.

It is an amenable number.

520221261 is a deficient number, since it is larger than the sum of its proper divisors (304098739).

520221261 is a wasteful number, since it uses less digits than its factorization.

520221261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 520221261 is about 22808.3594543755. The cubic root of 520221261 is about 804.2591906476.

Adding to 520221261 its reverse (162122025), we get a palindrome (682343286).

The spelling of 520221261 in words is "five hundred twenty million, two hundred twenty-one thousand, two hundred sixty-one".