981889 has 2 divisors, whose sum is σ = 981890. Its totient is φ = 981888.

The previous prime is 981887. The next prime is 981913. The reversal of 981889 is 988189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 11664 = 985^2 + 108^2 .

It is a cyclic number.

It is not a de Polignac number, because 981889 - 2¹ = 981887 is a prime.

Together with 981887, it forms a pair of twin primes.

981889 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (981887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490944 + 490945.

It is an arithmetic number, because the mean of its divisors is an integer number (490945).

2⁹⁸¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

981889 is a deficient number, since it is larger than the sum of its proper divisors (1).

981889 is an equidigital number, since it uses as much as digits as its factorization.

981889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 43.

The square root of 981889 is about 990.9031234182. The cubic root of 981889 is about 99.3926183443.

The spelling of 981889 in words is "nine hundred eighty-one thousand, eight hundred eighty-nine".