1111211161 has 2 divisors, whose sum is σ = 1111211162. Its totient is φ = 1111211160.

The previous prime is 1111211119. The next prime is 1111211173. The reversal of 1111211161 is 1611121111.

It is a m-pointer prime, because the next prime (1111211173) can be obtained adding 1111211161 to its product of digits (12).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 704583936 + 406627225 = 26544^2 + 20165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111211161 - 2¹³ = 1111202969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111211111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555605580 + 555605581.

It is an arithmetic number, because the mean of its divisors is an integer number (555605581).

Almost surely, 2^1111211161 is an apocalyptic number.

It is an amenable number.

1111211161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111211161 is an equidigital number, since it uses as much as digits as its factorization.

1111211161 is an evil number, because the sum of its binary digits is even.

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

The square root of 1111211161 is about 33334.8340478845. The cubic root of 1111211161 is about 1035.7752555449.

Adding to 1111211161 its reverse (1611121111), we get a palindrome (2722332272).

The spelling of 1111211161 in words is "one billion, one hundred eleven million, two hundred eleven thousand, one hundred sixty-one".