181445 has 8 divisors (see below), whose sum is σ = 237600. Its totient is φ = 131920.

The previous prime is 181439. The next prime is 181457. The reversal of 181445 is 544181.

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

It is a de Polignac number, because none of the positive numbers 2^k-181445 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1595 + ... + 1704.

It is an arithmetic number, because the mean of its divisors is an integer number (29700).

2¹⁸¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

181445 is a deficient number, since it is larger than the sum of its proper divisors (56155).

181445 is a wasteful number, since it uses less digits than its factorization.

181445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315.

The product of its digits is 640, while the sum is 23.

The square root of 181445 is about 425.9636134695. The cubic root of 181445 is about 56.6128477870.

It can be divided in two parts, 181 and 445, that added together give a palindrome (626).

The spelling of 181445 in words is "one hundred eighty-one thousand, four hundred forty-five".