1081603 has 4 divisors (see below), whose sum is σ = 1092208. Its totient is φ = 1071000.

The previous prime is 1081583. The next prime is 1081631. The reversal of 1081603 is 3061801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3061801 = 149 ⋅20549.

It is a cyclic number.

It is not a de Polignac number, because 1081603 - 2¹³ = 1073411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5148 + ... + 5353.

It is an arithmetic number, because the mean of its divisors is an integer number (273052).

2^1081603 is an apocalyptic number.

1081603 is a deficient number, since it is larger than the sum of its proper divisors (10605).

1081603 is a wasteful number, since it uses less digits than its factorization.

1081603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10604.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1081603 is about 1040.0014423067. The cubic root of 1081603 is about 102.6492926598.

It can be divided in two parts, 108 and 1603, that added together give a triangular number (1711 = T₅₈).

The spelling of 1081603 in words is "one million, eighty-one thousand, six hundred three".