981776889 has 16 divisors (see below), whose sum is σ = 1470830400. Its totient is φ = 647162208.

The previous prime is 981776869. The next prime is 981776899. The reversal of 981776889 is 988677189.

It is not a de Polignac number, because 981776889 - 2¹¹ = 981774841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981776819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201879 + ... + 206684.

It is an arithmetic number, because the mean of its divisors is an integer number (91926900).

Almost surely, 2^981776889 is an apocalyptic number.

It is an amenable number.

981776889 is a deficient number, since it is larger than the sum of its proper divisors (489053511).

981776889 is a wasteful number, since it uses less digits than its factorization.

981776889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408661 (or 408655 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The square root of 981776889 is about 31333.3191507060. The cubic root of 981776889 is about 993.8883535387. Note that the first 3 decimals are identical.

The spelling of 981776889 in words is "nine hundred eighty-one million, seven hundred seventy-six thousand, eight hundred eighty-nine".