985221011889 has 45 divisors (see below), whose sum is σ = 1524650810683. Its totient is φ = 633998495088.

The previous prime is 985221011861. The next prime is 985221011891. The reversal of 985221011889 is 988110122589.

The square root of 985221011889 is 992583.

It is a perfect power (a square), and thus also a powerful number.

985221011889 is a `hidden beast` number, since 9 + 8 + 522 + 101 + 1 + 8 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 516626000289 + 468595011600 = 718767^2 + 684540^2 .

It is not a de Polignac number, because 985221011889 - 2¹⁵ = 985220979121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985221011849) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 259062262 + ... + 259066064.

Almost surely, 2^985221011889 is an apocalyptic number.

985221011889 is the 992583-rd square number.

985221011889 is the 496292-nd centered octagonal number.

It is an amenable number.

985221011889 is a deficient number, since it is larger than the sum of its proper divisors (539429798794).

985221011889 is an frugal number, since it uses more digits than its factorization.

985221011889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7676 (or 3835 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 54.

The spelling of 985221011889 in words is "nine hundred eighty-five billion, two hundred twenty-one million, eleven thousand, eight hundred eighty-nine".