1101603 has 4 divisors (see below), whose sum is σ = 1468808. Its totient is φ = 734400.

The previous prime is 1101593. The next prime is 1101613. The reversal of 1101603 is 3061011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3061011 = 3 ⋅1020337.

It is an interprime number because it is at equal distance from previous prime (1101593) and next prime (1101613).

It is not a de Polignac number, because 1101603 - 2⁴ = 1101587 is a prime.

It is a D-number.

It is a Duffinian number.

1101603 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1101613) 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, 183598 + ... + 183603.

It is an arithmetic number, because the mean of its divisors is an integer number (367202).

2^1101603 is an apocalyptic number.

1101603 is a deficient number, since it is larger than the sum of its proper divisors (367205).

1101603 is an equidigital number, since it uses as much as digits as its factorization.

1101603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367204.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1101603 is about 1049.5727702261. The cubic root of 1101603 is about 103.2781309963.

Adding to 1101603 its reverse (3061011), we get a palindrome (4162614).

The spelling of 1101603 in words is "one million, one hundred one thousand, six hundred three".