181324381 has 8 divisors (see below), whose sum is σ = 207384320. Its totient is φ = 155303568.

The previous prime is 181324369. The next prime is 181324399. The reversal of 181324381 is 183423181.

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

It is not a de Polignac number, because 181324381 - 2⁵ = 181324349 is a prime.

It is a super-2 number, since 2×181324381² = 65757062290066322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181324321) 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, 940 + ... + 19066.

It is an arithmetic number, because the mean of its divisors is an integer number (25923040).

Almost surely, 2^181324381 is an apocalyptic number.

It is an amenable number.

181324381 is a deficient number, since it is larger than the sum of its proper divisors (26059939).

181324381 is a wasteful number, since it uses less digits than its factorization.

181324381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19563.

The product of its digits is 4608, while the sum is 31.

The square root of 181324381 is about 13465.6741754730. The cubic root of 181324381 is about 566.0030018528.

The spelling of 181324381 in words is "one hundred eighty-one million, three hundred twenty-four thousand, three hundred eighty-one".