240181 has 4 divisors (see below), whose sum is σ = 241164. Its totient is φ = 239200.

The previous prime is 240173. The next prime is 240197. The reversal of 240181 is 181042.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 72900 + 167281 = 270^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 240181 - 2³ = 240173 is a prime.

It is a super-2 number, since 2×240181² = 115373825522, which contains 22 as substring.

It is a Duffinian number.

240181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201 + ... + 721.

It is an arithmetic number, because the mean of its divisors is an integer number (60291).

2²⁴⁰¹⁸¹ is an apocalyptic number.

It is an amenable number.

240181 is a deficient number, since it is larger than the sum of its proper divisors (983).

240181 is an equidigital number, since it uses as much as digits as its factorization.

240181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 240181 is about 490.0826460915. The cubic root of 240181 is about 62.1602686679.

It can be divided in two parts, 2401 and 81, that multiplied together give a 4-th power (194481 = 21⁴).

The spelling of 240181 in words is "two hundred forty thousand, one hundred eighty-one".