8161121 has 2 divisors, whose sum is σ = 8161122. Its totient is φ = 8161120.

The previous prime is 8161081. The next prime is 8161183. The reversal of 8161121 is 1211618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4682896 + 3478225 = 2164^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 8161121 - 2²² = 3966817 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8161093 and 8161102.

It is not a weakly prime, because it can be changed into another prime (8163121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080560 + 4080561.

It is an arithmetic number, because the mean of its divisors is an integer number (4080561).

Almost surely, 2^8161121 is an apocalyptic number.

It is an amenable number.

8161121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161121 is an equidigital number, since it uses as much as digits as its factorization.

8161121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 20.

The square root of 8161121 is about 2856.7675789255. The cubic root of 8161121 is about 201.3337606407. Note that the first 3 decimals are identical.

Adding to 8161121 its reverse (1211618), we get a palindrome (9372739).

The spelling of 8161121 in words is "eight million, one hundred sixty-one thousand, one hundred twenty-one".