1091603 has 8 divisors (see below), whose sum is σ = 1176576. Its totient is φ = 1009800.

The previous prime is 1091591. The next prime is 1091609. The reversal of 1091603 is 3061901.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53 + ... + 1478.

It is an arithmetic number, because the mean of its divisors is an integer number (147072).

2^1091603 is an apocalyptic number.

1091603 is a deficient number, since it is larger than the sum of its proper divisors (84973).

1091603 is a wasteful number, since it uses less digits than its factorization.

1091603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1091603 is about 1044.7980666138. The cubic root of 1091603 is about 102.9646719575.

The spelling of 1091603 in words is "one million, ninety-one thousand, six hundred three".