1121111161 has 2 divisors, whose sum is σ = 1121111162. Its totient is φ = 1121111160.

The previous prime is 1121111119. The next prime is 1121111209. The reversal of 1121111161 is 1611111211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998876025 + 122235136 = 31605^2 + 11056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121111161 - 2²³ = 1112722553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121111111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560555580 + 560555581.

It is an arithmetic number, because the mean of its divisors is an integer number (560555581).

Almost surely, 2^1121111161 is an apocalyptic number.

It is an amenable number.

1121111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121111161 is an equidigital number, since it uses as much as digits as its factorization.

1121111161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12, while the sum is 16.

The square root of 1121111161 is about 33482.9980885822. The cubic root of 1121111161 is about 1038.8421411997.

Adding to 1121111161 its reverse (1611111211), we get a palindrome (2732222372).

The spelling of 1121111161 in words is "one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred sixty-one".