181107 has 6 divisors (see below), whose sum is σ = 261612. Its totient is φ = 120732.

The previous prime is 181087. The next prime is 181123. The reversal of 181107 is 701181.

It is not a de Polignac number, because 181107 - 2¹² = 177011 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 181107.

It is not an unprimeable number, because it can be changed into a prime (181157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10053 + ... + 10070.

It is an arithmetic number, because the mean of its divisors is an integer number (43602).

2¹⁸¹¹⁰⁷ is an apocalyptic number.

181107 is a deficient number, since it is larger than the sum of its proper divisors (80505).

181107 is a wasteful number, since it uses less digits than its factorization.

181107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20129 (or 20126 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The square root of 181107 is about 425.5666810266. The cubic root of 181107 is about 56.5776726896.

Adding to 181107 its reverse (701181), we get a palindrome (882288).

The spelling of 181107 in words is "one hundred eighty-one thousand, one hundred seven".