181369 has 4 divisors (see below), whose sum is σ = 184144. Its totient is φ = 178596.

The previous prime is 181361. The next prime is 181387. The reversal of 181369 is 963181.

It is a happy number.

181369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 181369 - 2³ = 181361 is a prime.

It is a super-2 number, since 2×181369² = 65789428322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181361) 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, 1287 + ... + 1420.

It is an arithmetic number, because the mean of its divisors is an integer number (46036).

2¹⁸¹³⁶⁹ is an apocalyptic number.

It is an amenable number.

181369 is a deficient number, since it is larger than the sum of its proper divisors (2775).

181369 is an equidigital number, since it uses as much as digits as its factorization.

181369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774.

The product of its digits is 1296, while the sum is 28.

The square root of 181369 is about 425.8743946283. The cubic root of 181369 is about 56.6049424028.

It can be divided in two parts, 18136 and 9, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 181369 in words is "one hundred eighty-one thousand, three hundred sixty-nine".