2011603 has 8 divisors (see below), whose sum is σ = 2290176. Its totient is φ = 1749000.

The previous prime is 2011601. The next prime is 2011613. The reversal of 2011603 is 3061102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2011603 - 2¹ = 2011601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3723 + ... + 4228.

It is an arithmetic number, because the mean of its divisors is an integer number (286272).

2^2011603 is an apocalyptic number.

2011603 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2011603 is a deficient number, since it is larger than the sum of its proper divisors (278573).

2011603 is a wasteful number, since it uses less digits than its factorization.

2011603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7985.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 2011603 is about 1418.3099097165. The cubic root of 2011603 is about 126.2352830605.

Adding to 2011603 its reverse (3061102), we get a palindrome (5072705).

The spelling of 2011603 in words is "two million, eleven thousand, six hundred three".