989090161 has 8 divisors (see below), whose sum is σ = 996863400. Its totient is φ = 981332352.

The previous prime is 989090147. The next prime is 989090177. The reversal of 989090161 is 161090989.

It can be written as a sum of positive squares in 4 ways, for example, as 74390625 + 914699536 = 8625^2 + 30244^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 989090161 - 2¹⁷ = 988959089 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 (989090761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147661 + ... + 154213.

It is an arithmetic number, because the mean of its divisors is an integer number (124607925).

Almost surely, 2^989090161 is an apocalyptic number.

It is an amenable number.

989090161 is a deficient number, since it is larger than the sum of its proper divisors (7773239).

989090161 is a wasteful number, since it uses less digits than its factorization.

989090161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 989090161 is about 31449.8038308667. The cubic root of 989090161 is about 996.3500813015.

The spelling of 989090161 in words is "nine hundred eighty-nine million, ninety thousand, one hundred sixty-one".