981503 has 4 divisors (see below), whose sum is σ = 983568. Its totient is φ = 979440.

The previous prime is 981493. The next prime is 981517. The reversal of 981503 is 305189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305189 = 103 ⋅2963.

It is a cyclic number.

It is not a de Polignac number, because 981503 - 2⁶ = 981439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83 + ... + 1403.

It is an arithmetic number, because the mean of its divisors is an integer number (245892).

2⁹⁸¹⁵⁰³ is an apocalyptic number.

981503 is a deficient number, since it is larger than the sum of its proper divisors (2065).

981503 is a wasteful number, since it uses less digits than its factorization.

981503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 981503 is about 990.7083324571. The cubic root of 981503 is about 99.3795922353.

The spelling of 981503 in words is "nine hundred eighty-one thousand, five hundred three".