2001331403 has 4 divisors (see below), whose sum is σ = 2002935000. Its totient is φ = 1999727808.

The previous prime is 2001331399. The next prime is 2001331429. The reversal of 2001331403 is 3041331002.

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 2001331403 - 2² = 2001331399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001331903) 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, 799925 + ... + 802422.

It is an arithmetic number, because the mean of its divisors is an integer number (500733750).

Almost surely, 2^2001331403 is an apocalyptic number.

2001331403 is a deficient number, since it is larger than the sum of its proper divisors (1603597).

2001331403 is a wasteful number, since it uses less digits than its factorization.

2001331403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603596.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 2001331403 is about 44736.2426115560. The cubic root of 2001331403 is about 1260.2005649904.

Adding to 2001331403 its reverse (3041331002), we get a palindrome (5042662405).

The spelling of 2001331403 in words is "two billion, one million, three hundred thirty-one thousand, four hundred three".