181012 has 18 divisors (see below), whose sum is σ = 347018. Its totient is φ = 82128.

The previous prime is 181003. The next prime is 181019. The reversal of 181012 is 210181.

It can be written as a sum of positive squares in only one way, i.e., 125316 + 55696 = 354^2 + 236^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

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 = 180983 and 181001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3039 + ... + 3097.

2¹⁸¹⁰¹² is an apocalyptic number.

It is an amenable number.

181012 is a deficient number, since it is larger than the sum of its proper divisors (166006).

181012 is a wasteful number, since it uses less digits than its factorization.

181012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 181012 is about 425.4550505048. The cubic root of 181012 is about 56.5677783196.

Multiplying 181012 by its sum of digits (13), we get a square (2353156 = 1534²).

181012 divided by its sum of digits (13) gives a square (13924 = 118²).

Adding to 181012 its reverse (210181), we get a palindrome (391193).

The spelling of 181012 in words is "one hundred eighty-one thousand, twelve".