8121434161 has 9 divisors (see below), whose sum is σ = 8177968299. Its totient is φ = 8065290024.

The previous prime is 8121434147. The next prime is 8121434183. The reversal of 8121434161 is 1614341218.

The square root of 8121434161 is 90119.

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

It can be written as a sum of positive squares in only one way, i.e., 5442750625 + 2678683536 = 73775^2 + 51756^2 .

It is not a de Polignac number, because 8121434161 - 2⁵ = 8121434129 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8121434261) 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, 20456815 + ... + 20457211.

Almost surely, 2^8121434161 is an apocalyptic number.

8121434161 is the 90119-th square number.

8121434161 is the 45060-th centered octagonal number.

It is an amenable number.

8121434161 is a deficient number, since it is larger than the sum of its proper divisors (56534138).

8121434161 is an frugal number, since it uses more digits than its factorization.

8121434161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 624 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The cubic root of 8121434161 is about 2010.0687386045.

Adding to 8121434161 its reverse (1614341218), we get a palindrome (9735775379).

The spelling of 8121434161 in words is "eight billion, one hundred twenty-one million, four hundred thirty-four thousand, one hundred sixty-one".