181481224 has 32 divisors (see below), whose sum is σ = 355792320. Its totient is φ = 86619456.

The previous prime is 181481219. The next prime is 181481231. The reversal of 181481224 is 422184181.

It is a nude number because it is divisible by every one of its digits.

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, 161914 + ... + 163030.

It is an arithmetic number, because the mean of its divisors is an integer number (11118510).

Almost surely, 2^181481224 is an apocalyptic number.

It is an amenable number.

181481224 is a deficient number, since it is larger than the sum of its proper divisors (174311096).

181481224 is a wasteful number, since it uses less digits than its factorization.

181481224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029 (or 2025 counting only the distinct ones).

The product of its digits is 4096, while the sum is 31.

The square root of 181481224 is about 13471.4967245663. The cubic root of 181481224 is about 566.1661496595.

It can be divided in two parts, 1814 and 81224, that added together give a palindrome (83038).

The spelling of 181481224 in words is "one hundred eighty-one million, four hundred eighty-one thousand, two hundred twenty-four".