1819116181 has 2 divisors, whose sum is σ = 1819116182. Its totient is φ = 1819116180.

The previous prime is 1819116179. The next prime is 1819116193. The reversal of 1819116181 is 1816119181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1386892081 + 432224100 = 37241^2 + 20790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1819116181 - 2¹ = 1819116179 is a prime.

It is a super-2 number, since 2×1819116181² = 6618367359952049522, which contains 22 as substring.

Together with 1819116179, it forms a pair of twin primes.

1819116181 is a strobogrammatic number because it is the same when read upside-down.

It is a self number, because there is not a number n which added to its sum of digits gives 1819116181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1819116281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909558090 + 909558091.

It is an arithmetic number, because the mean of its divisors is an integer number (909558091).

Almost surely, 2^1819116181 is an apocalyptic number.

It is an amenable number.

1819116181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1819116181 is an equidigital number, since it uses as much as digits as its factorization.

1819116181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 37.

The square root of 1819116181 is about 42651.0982390841. The cubic root of 1819116181 is about 1220.7314839776.

The spelling of 1819116181 in words is "one billion, eight hundred nineteen million, one hundred sixteen thousand, one hundred eighty-one".