181241 has 4 divisors (see below), whose sum is σ = 190800. Its totient is φ = 171684.

The previous prime is 181219. The next prime is 181243. The reversal of 181241 is 142181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 142181 = 13 ⋅10937.

It is a de Polignac number, because none of the positive numbers 2^k-181241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4751 + ... + 4788.

It is an arithmetic number, because the mean of its divisors is an integer number (47700).

2¹⁸¹²⁴¹ is an apocalyptic number.

It is an amenable number.

181241 is a deficient number, since it is larger than the sum of its proper divisors (9559).

181241 is an equidigital number, since it uses as much as digits as its factorization.

181241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9558.

The product of its digits is 64, while the sum is 17.

The square root of 181241 is about 425.7240890530. The cubic root of 181241 is about 56.5916230782.

Subtracting from 181241 its reverse (142181), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 181241 in words is "one hundred eighty-one thousand, two hundred forty-one".