241581 has 4 divisors (see below), whose sum is σ = 322112. Its totient is φ = 161052.

The previous prime is 241567. The next prime is 241589. The reversal of 241581 is 185142.

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.

It is not a de Polignac number, because 241581 - 2⁶ = 241517 is a prime.

It is a super-2 number, since 2×241581² = 116722759122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 241581.

It is not an unprimeable number, because it can be changed into a prime (241589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40261 + ... + 40266.

It is an arithmetic number, because the mean of its divisors is an integer number (80528).

2²⁴¹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

241581 is a deficient number, since it is larger than the sum of its proper divisors (80531).

241581 is an equidigital number, since it uses as much as digits as its factorization.

241581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80530.

The product of its digits is 320, while the sum is 21.

The square root of 241581 is about 491.5089012419. The cubic root of 241581 is about 62.2808108632.

The spelling of 241581 in words is "two hundred forty-one thousand, five hundred eighty-one".