981009 has 6 divisors (see below), whose sum is σ = 1417026. Its totient is φ = 654000.

The previous prime is 980999. The next prime is 981011. The reversal of 981009 is 900189.

981009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 804609 + 176400 = 897^2 + 420^2 .

It is a de Polignac number, because none of the positive numbers 2^k-981009 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981009.

It is not an unprimeable number, because it can be changed into a prime (981049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54492 + ... + 54509.

It is an arithmetic number, because the mean of its divisors is an integer number (236171).

2⁹⁸¹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

981009 is a deficient number, since it is larger than the sum of its proper divisors (436017).

981009 is a wasteful number, since it uses less digits than its factorization.

981009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109007 (or 109004 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 981009 is about 990.4589845117. The cubic root of 981009 is about 99.3629165324.

It can be divided in two parts, 9 and 81009, that added together give a palindrome (81018).

The spelling of 981009 in words is "nine hundred eighty-one thousand, nine".