989898961 has 4 divisors (see below), whose sum is σ = 990165924. Its totient is φ = 989632000.

The previous prime is 989898941. The next prime is 989898983. The reversal of 989898961 is 169898989.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 208975936 + 780923025 = 14456^2 + 27945^2 .

It is a cyclic number.

It is not a de Polignac number, because 989898961 - 2⁵ = 989898929 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989898941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127840 + ... + 135361.

It is an arithmetic number, because the mean of its divisors is an integer number (247541481).

Almost surely, 2^989898961 is an apocalyptic number.

It is an amenable number.

989898961 is a deficient number, since it is larger than the sum of its proper divisors (266963).

989898961 is a wasteful number, since it uses less digits than its factorization.

989898961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266962.

The product of its digits is 20155392, while the sum is 67.

The square root of 989898961 is about 31462.6597890261. The cubic root of 989898961 is about 996.6215861734.

The spelling of 989898961 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred sixty-one".