520421371 has 4 divisors (see below), whose sum is σ = 526691592. Its totient is φ = 514151152.

The previous prime is 520421353. The next prime is 520421399. The reversal of 520421371 is 173124025.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520421371 - 2¹⁷ = 520290299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520421311) 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, 3134986 + ... + 3135151.

It is an arithmetic number, because the mean of its divisors is an integer number (131672898).

Almost surely, 2^520421371 is an apocalyptic number.

520421371 is a deficient number, since it is larger than the sum of its proper divisors (6270221).

520421371 is an equidigital number, since it uses as much as digits as its factorization.

520421371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270220.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 520421371 is about 22812.7458014155. The cubic root of 520421371 is about 804.3623004121.

Adding to 520421371 its reverse (173124025), we get a palindrome (693545396).

The spelling of 520421371 in words is "five hundred twenty million, four hundred twenty-one thousand, three hundred seventy-one".