240531521 has 12 divisors (see below), whose sum is σ = 256111680. Its totient is φ = 225852480.

The previous prime is 240531509. The next prime is 240531527. The reversal of 240531521 is 125135042.

It is not a de Polignac number, because 240531521 - 2¹⁴ = 240515137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (240531527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181700 + ... + 183018.

It is an arithmetic number, because the mean of its divisors is an integer number (21342640).

Almost surely, 2^240531521 is an apocalyptic number.

It is an amenable number.

240531521 is a deficient number, since it is larger than the sum of its proper divisors (15580159).

240531521 is a wasteful number, since it uses less digits than its factorization.

240531521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984 (or 1967 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 240531521 is about 15509.0786638021. The cubic root of 240531521 is about 621.9049294148.

Adding to 240531521 its reverse (125135042), we get a palindrome (365666563).

The spelling of 240531521 in words is "two hundred forty million, five hundred thirty-one thousand, five hundred twenty-one".