2811981181 has 2 divisors, whose sum is σ = 2811981182. Its totient is φ = 2811981180.

The previous prime is 2811981149. The next prime is 2811981217. The reversal of 2811981181 is 1811891182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1879656025 + 932325156 = 43355^2 + 30534^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811981181 - 2⁵ = 2811981149 is a prime.

It is a super-2 number, since 2×2811981181² = 15814476324596309522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2811981131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1405990590 + 1405990591.

It is an arithmetic number, because the mean of its divisors is an integer number (1405990591).

Almost surely, 2^2811981181 is an apocalyptic number.

It is an amenable number.

2811981181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2811981181 is an equidigital number, since it uses as much as digits as its factorization.

2811981181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 40.

The square root of 2811981181 is about 53028.1168909476. The cubic root of 2811981181 is about 1411.4672420068.

The spelling of 2811981181 in words is "two billion, eight hundred eleven million, nine hundred eighty-one thousand, one hundred eighty-one".