981181 has 6 divisors (see below), whose sum is σ = 1014846. Its totient is φ = 948600.

The previous prime is 981173. The next prime is 981187. The reversal of 981181 is 181189.

It can be written as a sum of positive squares in only one way, i.e., 864900 + 116281 = 930^2 + 341^2 .

It is not a de Polignac number, because 981181 - 2³ = 981173 is a prime.

It is a super-3 number, since 3×981181³ = 2833796398333658223, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981187) 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, 451 + ... + 1471.

It is an arithmetic number, because the mean of its divisors is an integer number (169141).

2⁹⁸¹¹⁸¹ is an apocalyptic number.

It is an amenable number.

981181 is a deficient number, since it is larger than the sum of its proper divisors (33665).

981181 is a wasteful number, since it uses less digits than its factorization.

981181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1052 counting only the distinct ones).

The product of its digits is 576, while the sum is 28.

The square root of 981181 is about 990.5458091376. The cubic root of 981181 is about 99.3687232827.

The spelling of 981181 in words is "nine hundred eighty-one thousand, one hundred eighty-one".