521313401 has 18 divisors (see below), whose sum is σ = 621675630. Its totient is φ = 435872640.

The previous prime is 521313389. The next prime is 521313413. The reversal of 521313401 is 104313125.

It is an interprime number because it is at equal distance from previous prime (521313389) and next prime (521313413).

It can be written as a sum of positive squares in 3 ways, for example, as 561001 + 520752400 = 749^2 + 22820^2 .

It is a de Polignac number, because none of the positive numbers 2^k-521313401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521313421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 79205 + ... + 85533.

It is an arithmetic number, because the mean of its divisors is an integer number (34537535).

Almost surely, 2^521313401 is an apocalyptic number.

It is an amenable number.

521313401 is a deficient number, since it is larger than the sum of its proper divisors (100362229).

521313401 is an equidigital number, since it uses as much as digits as its factorization.

521313401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6425 (or 6377 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 521313401 is about 22832.2885624722. The cubic root of 521313401 is about 804.8216113855.

Adding to 521313401 its reverse (104313125), we get a palindrome (625626526).

The spelling of 521313401 in words is "five hundred twenty-one million, three hundred thirteen thousand, four hundred one".