889989561 has 6 divisors (see below), whose sum is σ = 1285540490. Its totient is φ = 593326368.

The previous prime is 889989557. The next prime is 889989637. The reversal of 889989561 is 165989988.

It can be written as a sum of positive squares in only one way, i.e., 758451600 + 131537961 = 27540^2 + 11469^2 .

It is not a de Polignac number, because 889989561 - 2² = 889989557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (889989161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49443856 + ... + 49443873.

Almost surely, 2^889989561 is an apocalyptic number.

It is an amenable number.

889989561 is a deficient number, since it is larger than the sum of its proper divisors (395550929).

889989561 is a wasteful number, since it uses less digits than its factorization.

889989561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98887735 (or 98887732 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 63.

The square root of 889989561 is about 29832.6928218021. The cubic root of 889989561 is about 961.8964108155.

The spelling of 889989561 in words is "eight hundred eighty-nine million, nine hundred eighty-nine thousand, five hundred sixty-one".