981616189 has 2 divisors, whose sum is σ = 981616190. Its totient is φ = 981616188.

The previous prime is 981616187. The next prime is 981616199.

It is a happy number.

981616189 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., 676520100 + 305096089 = 26010^2 + 17467^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 981616189 - 2¹ = 981616187 is a prime.

Together with 981616187, it forms a pair of twin primes.

It is a Chen 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 (981616187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490808094 + 490808095.

It is an arithmetic number, because the mean of its divisors is an integer number (490808095).

Almost surely, 2^981616189 is an apocalyptic number.

It is an amenable number.

981616189 is a deficient number, since it is larger than the sum of its proper divisors (1).

981616189 is an equidigital number, since it uses as much as digits as its factorization.

981616189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 49.

The square root of 981616189 is about 31330.7546828990. The cubic root of 981616189 is about 993.8341231002.

The spelling of 981616189 in words is "nine hundred eighty-one million, six hundred sixteen thousand, one hundred eighty-nine".