2018181791 has 2 divisors, whose sum is σ = 2018181792. Its totient is φ = 2018181790.

The previous prime is 2018181787. The next prime is 2018181829. The reversal of 2018181791 is 1971818102.

It is an a-pointer prime, because the next prime (2018181829) can be obtained adding 2018181791 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2018181791 - 2² = 2018181787 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2018181721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009090895 + 1009090896.

It is an arithmetic number, because the mean of its divisors is an integer number (1009090896).

Almost surely, 2^2018181791 is an apocalyptic number.

2018181791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2018181791 is an equidigital number, since it uses as much as digits as its factorization.

2018181791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 38.

The square root of 2018181791 is about 44924.1782451276. The cubic root of 2018181791 is about 1263.7274753540.

Adding to 2018181791 its reverse (1971818102), we get a palindrome (3989999893).

The spelling of 2018181791 in words is "two billion, eighteen million, one hundred eighty-one thousand, seven hundred ninety-one".