181641 has 8 divisors (see below), whose sum is σ = 244224. Its totient is φ = 120080.

The previous prime is 181639. The next prime is 181667. The reversal of 181641 is 146181.

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 181641 - 2¹ = 181639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181141) 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, 415 + ... + 731.

It is an arithmetic number, because the mean of its divisors is an integer number (30528).

2¹⁸¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

181641 is a deficient number, since it is larger than the sum of its proper divisors (62583).

181641 is a wasteful number, since it uses less digits than its factorization.

181641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511.

The product of its digits is 192, while the sum is 21.

The square root of 181641 is about 426.1936179719. The cubic root of 181641 is about 56.6332251744.

The spelling of 181641 in words is "one hundred eighty-one thousand, six hundred forty-one".