981189 has 36 divisors (see below), whose sum is σ = 1680588. Its totient is φ = 549120.

The previous prime is 981187. The next prime is 981199.

981189 = 23² + 24² + ... + 143².

981189 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 736164 + 245025 = 858^2 + 495^2 .

It is not a de Polignac number, because 981189 - 2¹ = 981187 is a prime.

It is a Curzon 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 35 ways as a sum of consecutive naturals, for example, 18487 + ... + 18539.

It is an arithmetic number, because the mean of its divisors is an integer number (46683).

2⁹⁸¹¹⁸⁹ is an apocalyptic number.

981189 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

981189 is a deficient number, since it is larger than the sum of its proper divisors (699399).

981189 is a wasteful number, since it uses less digits than its factorization.

981189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 84 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 981189 is about 990.5498473070. The cubic root of 981189 is about 99.3689933476.

The spelling of 981189 in words is "nine hundred eighty-one thousand, one hundred eighty-nine".