986805811161 has 9 divisors (see below), whose sum is σ = 1425390476341. Its totient is φ = 657868554012.

The previous prime is 986805811153. The next prime is 986805811163. The reversal of 986805811161 is 161118508689.

The square root of 986805811161 is 993381.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 986805811161 - 2³ = 986805811153 is a prime.

It is a super-2 number, since 2×986805811161² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 986805811098 and 986805811107.

It is not an unprimeable number, because it can be changed into a prime (986805811163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2814580 + ... + 3145706.

Almost surely, 2^986805811161 is an apocalyptic number.

986805811161 is the 993381-st square number.

986805811161 is the 496691-st centered octagonal number.

It is an amenable number.

986805811161 is a deficient number, since it is larger than the sum of its proper divisors (438584665180).

986805811161 is an frugal number, since it uses more digits than its factorization.

986805811161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662260 (or 331130 counting only the distinct ones).

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

The spelling of 986805811161 in words is "nine hundred eighty-six billion, eight hundred five million, eight hundred eleven thousand, one hundred sixty-one".