1009181818191 has 8 divisors (see below), whose sum is σ = 1345723222144. Its totient is φ = 672714146520.

The previous prime is 1009181818157. The next prime is 1009181818201. The reversal of 1009181818191 is 1918181819001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1009181818191 - 2¹¹ = 1009181816143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1009181818191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009181818111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18401125 + ... + 18455886.

It is an arithmetic number, because the mean of its divisors is an integer number (168215402768).

Almost surely, 2^{1009181818191} is an apocalyptic number.

1009181818191 is a deficient number, since it is larger than the sum of its proper divisors (336541403953).

1009181818191 is an equidigital number, since it uses as much as digits as its factorization.

1009181818191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36866141.

The product of its (nonzero) digits is 41472, while the sum is 48.

The spelling of 1009181818191 in words is "one trillion, nine billion, one hundred eighty-one million, eight hundred eighteen thousand, one hundred ninety-one".