1981003 has 8 divisors (see below), whose sum is σ = 2046528. Its totient is φ = 1916544.

The previous prime is 1980991. The next prime is 1981037. The reversal of 1981003 is 3001891.

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

It is a cyclic number.

It is not a de Polignac number, because 1981003 - 2⁹ = 1980491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5125 + ... + 5497.

It is an arithmetic number, because the mean of its divisors is an integer number (255816).

2^1981003 is an apocalyptic number.

1981003 is a deficient number, since it is larger than the sum of its proper divisors (65525).

1981003 is a wasteful number, since it uses less digits than its factorization.

1981003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1981003 is about 1407.4810833542. The cubic root of 1981003 is about 125.5919232571.

Adding to 1981003 its reverse (3001891), we get a palindrome (4982894).

The spelling of 1981003 in words is "one million, nine hundred eighty-one thousand, three".