4111891081 has 2 divisors, whose sum is σ = 4111891082. Its totient is φ = 4111891080.

The previous prime is 4111891037. The next prime is 4111891151. The reversal of 4111891081 is 1801981114.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2344109056 + 1767782025 = 48416^2 + 42045^2 .

It is a cyclic number.

It is not a de Polignac number, because 4111891081 - 2¹⁵ = 4111858313 is a prime.

It is a super-2 number, since 2×4111891081² = 33815296524014697122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4111891001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2055945540 + 2055945541.

It is an arithmetic number, because the mean of its divisors is an integer number (2055945541).

Almost surely, 2^4111891081 is an apocalyptic number.

It is an amenable number.

4111891081 is a deficient number, since it is larger than the sum of its proper divisors (1).

4111891081 is an equidigital number, since it uses as much as digits as its factorization.

4111891081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 34.

The square root of 4111891081 is about 64124.0288893329. The cubic root of 4111891081 is about 1602.0664810579.

The spelling of 4111891081 in words is "four billion, one hundred eleven million, eight hundred ninety-one thousand, eighty-one".