1111266161 has 2 divisors, whose sum is σ = 1111266162. Its totient is φ = 1111266160.

The previous prime is 1111266139. The next prime is 1111266199. The reversal of 1111266161 is 1616621111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085307136 + 25959025 = 32944^2 + 5095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111266161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1111266161.

It is not a weakly prime, because it can be changed into another prime (1111266131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555633080 + 555633081.

It is an arithmetic number, because the mean of its divisors is an integer number (555633081).

Almost surely, 2^1111266161 is an apocalyptic number.

It is an amenable number.

1111266161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111266161 is an equidigital number, since it uses as much as digits as its factorization.

1111266161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 1111266161 is about 33335.6590005357. The cubic root of 1111266161 is about 1035.7923440160.

Adding to 1111266161 its reverse (1616621111), we get a palindrome (2727887272).

The spelling of 1111266161 in words is "one billion, one hundred eleven million, two hundred sixty-six thousand, one hundred sixty-one".