1118818081 has 2 divisors, whose sum is σ = 1118818082. Its totient is φ = 1118818080.

The previous prime is 1118818069. The next prime is 1118818087. The reversal of 1118818081 is 1808188111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645973056 + 472845025 = 25416^2 + 21745^2 .

It is an emirp because it is prime and its reverse (1808188111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1118818081 - 2¹¹ = 1118816033 is a prime.

It is a super-2 number, since 2×1118818081² = 2503507796745045122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1118818081.

It is not a weakly prime, because it can be changed into another prime (1118818087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559409040 + 559409041.

It is an arithmetic number, because the mean of its divisors is an integer number (559409041).

Almost surely, 2^1118818081 is an apocalyptic number.

It is an amenable number.

1118818081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118818081 is an equidigital number, since it uses as much as digits as its factorization.

1118818081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 37.

The square root of 1118818081 is about 33448.7381077373. The cubic root of 1118818081 is about 1038.1333877808.

The spelling of 1118818081 in words is "one billion, one hundred eighteen million, eight hundred eighteen thousand, eighty-one".