981838189 has 2 divisors, whose sum is σ = 981838190. Its totient is φ = 981838188.

The previous prime is 981838183. The next prime is 981838211.

981838189 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670033225 + 311804964 = 25885^2 + 17658^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 981838189 - 2⁵ = 981838157 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981838183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490919094 + 490919095.

It is an arithmetic number, because the mean of its divisors is an integer number (490919095).

Almost surely, 2^981838189 is an apocalyptic number.

It is an amenable number.

981838189 is a deficient number, since it is larger than the sum of its proper divisors (1).

981838189 is an equidigital number, since it uses as much as digits as its factorization.

981838189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 55.

The square root of 981838189 is about 31334.2973273696. The cubic root of 981838189 is about 993.9090385127.

The spelling of 981838189 in words is "nine hundred eighty-one million, eight hundred thirty-eight thousand, one hundred eighty-nine".