2001320401 has 4 divisors (see below), whose sum is σ = 2001410100. Its totient is φ = 2001230704.

The previous prime is 2001320389. The next prime is 2001320437. The reversal of 2001320401 is 1040231002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 611820225 + 1389500176 = 24735^2 + 37276^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001320401 - 2²¹ = 1999223249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001320501) 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, 17655 + ... + 65683.

It is an arithmetic number, because the mean of its divisors is an integer number (500352525).

Almost surely, 2^2001320401 is an apocalyptic number.

It is an amenable number.

2001320401 is a deficient number, since it is larger than the sum of its proper divisors (89699).

2001320401 is an equidigital number, since it uses as much as digits as its factorization.

2001320401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89698.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2001320401 is about 44736.1196462098. The cubic root of 2001320401 is about 1260.1982557357.

Adding to 2001320401 its reverse (1040231002), we get a palindrome (3041551403).

The spelling of 2001320401 in words is "two billion, one million, three hundred twenty thousand, four hundred one".