1166819081 has 2 divisors, whose sum is σ = 1166819082. Its totient is φ = 1166819080.

The previous prime is 1166819053. The next prime is 1166819083. The reversal of 1166819081 is 1809186611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 788711056 + 378108025 = 28084^2 + 19445^2 .

It is an emirp because it is prime and its reverse (1809186611) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1806189911 and 1199816081.

It is a cyclic number.

It is not a de Polignac number, because 1166819081 - 2²² = 1162624777 is a prime.

It is a super-2 number, since 2×1166819081² = 2722933535571369122, which contains 22 as substring.

Together with 1166819083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1166819083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583409540 + 583409541.

It is an arithmetic number, because the mean of its divisors is an integer number (583409541).

Almost surely, 2^1166819081 is an apocalyptic number.

It is an amenable number.

1166819081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166819081 is an equidigital number, since it uses as much as digits as its factorization.

1166819081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 1166819081 is about 34158.7335977199. The cubic root of 1166819081 is about 1052.7724406483.

The spelling of 1166819081 in words is "one billion, one hundred sixty-six million, eight hundred nineteen thousand, eighty-one".