981881 has 4 divisors (see below), whose sum is σ = 985332. Its totient is φ = 978432.

The previous prime is 981823. The next prime is 981887. The reversal of 981881 is 188189.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 512656 + 469225 = 716^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 981881 - 2⁶ = 981817 is a prime.

It is a super-2 number, since 2×981881² = 1928180596322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1256 + ... + 1881.

It is an arithmetic number, because the mean of its divisors is an integer number (246333).

2⁹⁸¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

981881 is a deficient number, since it is larger than the sum of its proper divisors (3451).

981881 is a wasteful number, since it uses less digits than its factorization.

981881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3450.

The product of its digits is 4608, while the sum is 35.

The square root of 981881 is about 990.8990866884. The cubic root of 981881 is about 99.3923484077.

It can be divided in two parts, 98188 and 1, that added together give a palindrome (98189).

The spelling of 981881 in words is "nine hundred eighty-one thousand, eight hundred eighty-one".