981813 has 12 divisors (see below), whose sum is σ = 1523040. Its totient is φ = 560952.

The previous prime is 981811. The next prime is 981817. The reversal of 981813 is 318189.

It is not a de Polignac number, because 981813 - 2¹ = 981811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3193 + ... + 3486.

It is an arithmetic number, because the mean of its divisors is an integer number (126920).

2⁹⁸¹⁸¹³ is an apocalyptic number.

It is an amenable number.

981813 is a deficient number, since it is larger than the sum of its proper divisors (541227).

981813 is a wasteful number, since it uses less digits than its factorization.

981813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696 (or 6689 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 981813 is about 990.8647738213. The cubic root of 981813 is about 99.3900538881.

The spelling of 981813 in words is "nine hundred eighty-one thousand, eight hundred thirteen".