11131603 has 4 divisors (see below), whose sum is σ = 12721840. Its totient is φ = 9541368.

The previous prime is 11131597. The next prime is 11131613. The reversal of 11131603 is 30613111.

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 11131603 - 2²¹ = 9034451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11131613) 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, 795108 + ... + 795121.

It is an arithmetic number, because the mean of its divisors is an integer number (3180460).

Almost surely, 2^11131603 is an apocalyptic number.

11131603 is a deficient number, since it is larger than the sum of its proper divisors (1590237).

11131603 is an equidigital number, since it uses as much as digits as its factorization.

11131603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590236.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 11131603 is about 3336.4057007504. The cubic root of 11131603 is about 223.2814119047.

Adding to 11131603 its reverse (30613111), we get a palindrome (41744714).

The spelling of 11131603 in words is "eleven million, one hundred thirty-one thousand, six hundred three".