981603839 has 4 divisors (see below), whose sum is σ = 981723456. Its totient is φ = 981484224.

The previous prime is 981603811. The next prime is 981603841. The reversal of 981603839 is 938306189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938306189 = 4099 ⋅228911.

It is a cyclic number.

It is not a de Polignac number, because 981603839 - 2⁸ = 981603583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 981603793 and 981603802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981603869) 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, 46514 + ... + 64239.

It is an arithmetic number, because the mean of its divisors is an integer number (245430864).

Almost surely, 2^981603839 is an apocalyptic number.

981603839 is a deficient number, since it is larger than the sum of its proper divisors (119617).

981603839 is a wasteful number, since it uses less digits than its factorization.

981603839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119616.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 981603839 is about 31330.5575915910. The cubic root of 981603839 is about 993.8299551770.

The spelling of 981603839 in words is "nine hundred eighty-one million, six hundred three thousand, eight hundred thirty-nine".