1018191910181 has 2 divisors, whose sum is σ = 1018191910182. Its totient is φ = 1018191910180.

The previous prime is 1018191910163. The next prime is 1018191910193. The reversal of 1018191910181 is 1810191918101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 979622878081 + 38569032100 = 989759^2 + 196390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018191910181 - 2⁶ = 1018191910117 is a prime.

It is a super-2 number, since 2×1018191910181² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1018191510181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509095955090 + 509095955091.

It is an arithmetic number, because the mean of its divisors is an integer number (509095955091).

Almost surely, 2^{1018191910181} is an apocalyptic number.

It is an amenable number.

1018191910181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018191910181 is an equidigital number, since it uses as much as digits as its factorization.

1018191910181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 41.

The spelling of 1018191910181 in words is "one trillion, eighteen billion, one hundred ninety-one million, nine hundred ten thousand, one hundred eighty-one".