11111161 has 2 divisors, whose sum is σ = 11111162. Its totient is φ = 11111160.

The previous prime is 11111141. The next prime is 11111171. The reversal of 11111161 is 16111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7595536 + 3515625 = 2756^2 + 1875^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111161 - 2¹¹ = 11109113 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555580 + 5555581.

It is an arithmetic number, because the mean of its divisors is an integer number (5555581).

Almost surely, 2^11111161 is an apocalyptic number.

It is an amenable number.

11111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111161 is an equidigital number, since it uses as much as digits as its factorization.

11111161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6, while the sum is 13.

The square root of 11111161 is about 3333.3408166583. The cubic root of 11111161 is about 223.1446506662.

Adding to 11111161 its reverse (16111111), we get a palindrome (27222272).

It can be divided in two parts, 11111 and 161, that multiplied together give a palindrome (1788871).

The spelling of 11111161 in words is "eleven million, one hundred eleven thousand, one hundred sixty-one".