2011128181 has 2 divisors, whose sum is σ = 2011128182. Its totient is φ = 2011128180.

The previous prime is 2011128149. The next prime is 2011128199. The reversal of 2011128181 is 1818211102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1184048100 + 827080081 = 34410^2 + 28759^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011128181 - 2⁵ = 2011128149 is a prime.

It is a super-2 number, since 2×2011128181² = 8089273120824737522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011128881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005564090 + 1005564091.

It is an arithmetic number, because the mean of its divisors is an integer number (1005564091).

Almost surely, 2^2011128181 is an apocalyptic number.

It is an amenable number.

2011128181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011128181 is an equidigital number, since it uses as much as digits as its factorization.

2011128181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 25.

The square root of 2011128181 is about 44845.6038090692. The cubic root of 2011128181 is about 1262.2535008211.

Adding to 2011128181 its reverse (1818211102), we get a palindrome (3829339283).

The spelling of 2011128181 in words is "two billion, eleven million, one hundred twenty-eight thousand, one hundred eighty-one".