9678821161 has 9 divisors (see below), whose sum is σ = 9766273629. Its totient is φ = 9592147500.

The previous prime is 9678821129. The next prime is 9678821183. The reversal of 9678821161 is 1611288769.

The square root of 9678821161 is 98381.

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

It is not a de Polignac number, because 9678821161 - 2⁵ = 9678821129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9678821461) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12887536 + ... + 12888286.

Almost surely, 2^9678821161 is an apocalyptic number.

9678821161 is the 98381-st square number.

9678821161 is the 49191-st centered octagonal number.

It is an amenable number.

9678821161 is a deficient number, since it is larger than the sum of its proper divisors (87452468).

9678821161 is an frugal number, since it uses more digits than its factorization.

9678821161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764 (or 882 counting only the distinct ones).

The product of its digits is 290304, while the sum is 49.

The cubic root of 9678821161 is about 2131.1179566964.

Multiplying 9678821161 by its sum of digits (49), we get a square (474262236889 = 688667²).

The spelling of 9678821161 in words is "nine billion, six hundred seventy-eight million, eight hundred twenty-one thousand, one hundred sixty-one".