2001020113 has 4 divisors (see below), whose sum is σ = 2001743460. Its totient is φ = 2000296768.

The previous prime is 2001020101. The next prime is 2001020117. The reversal of 2001020113 is 3110201002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 482593024 + 1518427089 = 21968^2 + 38967^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001020113 - 2¹³ = 2001011921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001020113.

It is not an unprimeable number, because it can be changed into a prime (2001020117) 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, 357508 + ... + 363061.

It is an arithmetic number, because the mean of its divisors is an integer number (500435865).

Almost surely, 2^2001020113 is an apocalyptic number.

It is an amenable number.

2001020113 is a deficient number, since it is larger than the sum of its proper divisors (723347).

2001020113 is an equidigital number, since it uses as much as digits as its factorization.

2001020113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723346.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2001020113 is about 44732.7633061048. The cubic root of 2001020113 is about 1260.1352237924.

Adding to 2001020113 its reverse (3110201002), we get a palindrome (5111221115).

The spelling of 2001020113 in words is "two billion, one million, twenty thousand, one hundred thirteen".