181684481 has 8 divisors (see below), whose sum is σ = 200126784. Its totient is φ = 163563120.

The previous prime is 181684471. The next prime is 181684501. The reversal of 181684481 is 184486181.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 181684481 - 2¹⁰ = 181683457 is a prime.

It is a super-2 number, since 2×181684481² = 66018501272478722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181684421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79046 + ... + 81311.

It is an arithmetic number, because the mean of its divisors is an integer number (25015848).

Almost surely, 2^181684481 is an apocalyptic number.

181684481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

181684481 is a deficient number, since it is larger than the sum of its proper divisors (18442303).

181684481 is a wasteful number, since it uses less digits than its factorization.

181684481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160471.

The product of its digits is 49152, while the sum is 41.

The square root of 181684481 is about 13479.0385784744. The cubic root of 181684481 is about 566.3774374454.

The spelling of 181684481 in words is "one hundred eighty-one million, six hundred eighty-four thousand, four hundred eighty-one".