520321401 has 10 divisors (see below), whose sum is σ = 777270362. Its totient is φ = 346880880.

The previous prime is 520321379. The next prime is 520321409. The reversal of 520321401 is 104123025.

520321401 is a `hidden beast` number, since 520 + 3 + 2 + 140 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 364046400 + 156275001 = 19080^2 + 12501^2 .

It is not a de Polignac number, because 520321401 - 2⁵ = 520321369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520321409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3211780 + ... + 3211941.

Almost surely, 2^520321401 is an apocalyptic number.

It is an amenable number.

520321401 is a deficient number, since it is larger than the sum of its proper divisors (256948961).

520321401 is an equidigital number, since it uses as much as digits as its factorization.

520321401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6423733 (or 6423724 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 520321401 is about 22810.5545965020. The cubic root of 520321401 is about 804.3107926320.

Adding to 520321401 its reverse (104123025), we get a palindrome (624444426).

The spelling of 520321401 in words is "five hundred twenty million, three hundred twenty-one thousand, four hundred one".