1165603 has 4 divisors (see below), whose sum is σ = 1170720. Its totient is φ = 1160488.

The previous prime is 1165583. The next prime is 1165643. The reversal of 1165603 is 3065611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3065611 = 41 ⋅74771.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165643) 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, 2200 + ... + 2677.

It is an arithmetic number, because the mean of its divisors is an integer number (292680).

2^1165603 is an apocalyptic number.

1165603 is a deficient number, since it is larger than the sum of its proper divisors (5117).

1165603 is an equidigital number, since it uses as much as digits as its factorization.

1165603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5116.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1165603 is about 1079.6309554658. The cubic root of 1165603 is about 105.2406573706.

The spelling of 1165603 in words is "one million, one hundred sixty-five thousand, six hundred three".