181018 has 8 divisors (see below), whose sum is σ = 280980. Its totient is φ = 87360.

The previous prime is 181003. The next prime is 181019. The reversal of 181018 is 810181.

It can be written as a sum of positive squares in 2 ways, for example, as 157609 + 23409 = 397^2 + 153^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 180986 and 181004.

It is not an unprimeable number, because it can be changed into a prime (181019) 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, 1503 + ... + 1618.

2¹⁸¹⁰¹⁸ is an apocalyptic number.

181018 is a deficient number, since it is larger than the sum of its proper divisors (99962).

181018 is a wasteful number, since it uses less digits than its factorization.

181018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 181018 is about 425.4621017200. The cubic root of 181018 is about 56.5684033296.

Adding to 181018 its reverse (810181), we get a palindrome (991199).

The spelling of 181018 in words is "one hundred eighty-one thousand, eighteen".