10809891181 has 4 divisors (see below), whose sum is σ = 10813269312. Its totient is φ = 10806513052.

The previous prime is 10809891149. The next prime is 10809891193. The reversal of 10809891181 is 18119890801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18119890801 = 25633 ⋅706897.

It is a cyclic number.

It is not a de Polignac number, because 10809891181 - 2⁵ = 10809891149 is a prime.

It is a super-2 number, since 2×10809891181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10809891481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1684261 + ... + 1690666.

It is an arithmetic number, because the mean of its divisors is an integer number (2703317328).

Almost surely, 2^10809891181 is an apocalyptic number.

It is an amenable number.

10809891181 is a deficient number, since it is larger than the sum of its proper divisors (3378131).

10809891181 is an equidigital number, since it uses as much as digits as its factorization.

10809891181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378130.

The product of its (nonzero) digits is 41472, while the sum is 46.

The spelling of 10809891181 in words is "ten billion, eight hundred nine million, eight hundred ninety-one thousand, one hundred eighty-one".