240315521 has 4 divisors (see below), whose sum is σ = 240356052. Its totient is φ = 240274992.

The previous prime is 240315499. The next prime is 240315529. The reversal of 240315521 is 125513042.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125513042 = 2 ⋅62756521.

It can be written as a sum of positive squares in 2 ways, for example, as 139594225 + 100721296 = 11815^2 + 10036^2 .

It is a cyclic number.

It is not a de Polignac number, because 240315521 - 2⁶ = 240315457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240315529) 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, 9446 + ... + 23871.

It is an arithmetic number, because the mean of its divisors is an integer number (60089013).

Almost surely, 2^240315521 is an apocalyptic number.

It is an amenable number.

240315521 is a deficient number, since it is larger than the sum of its proper divisors (40531).

240315521 is an equidigital number, since it uses as much as digits as its factorization.

240315521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40530.

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

The square root of 240315521 is about 15502.1134365608. The cubic root of 240315521 is about 621.7187144652.

Adding to 240315521 its reverse (125513042), we get a palindrome (365828563).

The spelling of 240315521 in words is "two hundred forty million, three hundred fifteen thousand, five hundred twenty-one".