240531 has 4 divisors (see below), whose sum is σ = 320712. Its totient is φ = 160352.

The previous prime is 240517. The next prime is 240551. The reversal of 240531 is 135042.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 240531 - 2¹⁵ = 207763 is a prime.

It is a super-2 number, since 2×240531² = 115710323922, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 240531.

It is not an unprimeable number, because it can be changed into a prime (240551) 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, 40086 + ... + 40091.

It is an arithmetic number, because the mean of its divisors is an integer number (80178).

2²⁴⁰⁵³¹ is an apocalyptic number.

240531 is a deficient number, since it is larger than the sum of its proper divisors (80181).

240531 is an equidigital number, since it uses as much as digits as its factorization.

240531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80180.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 240531 is about 490.4395987275. The cubic root of 240531 is about 62.1904480392.

Adding to 240531 its reverse (135042), we get a palindrome (375573).

The spelling of 240531 in words is "two hundred forty thousand, five hundred thirty-one".