240315251521 has 2 divisors, whose sum is σ = 240315251522. Its totient is φ = 240315251520.

The previous prime is 240315251459. The next prime is 240315251551. The reversal of 240315251521 is 125152513042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159491604496 + 80823647025 = 399364^2 + 284295^2 .

It is a cyclic number.

It is not a de Polignac number, because 240315251521 - 2²¹ = 240313154369 is a prime.

It is a super-2 number, since 2×240315251521² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (240315251551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120157625760 + 120157625761.

It is an arithmetic number, because the mean of its divisors is an integer number (120157625761).

Almost surely, 2^240315251521 is an apocalyptic number.

It is an amenable number.

240315251521 is a deficient number, since it is larger than the sum of its proper divisors (1).

240315251521 is an equidigital number, since it uses as much as digits as its factorization.

240315251521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 240315251521 its reverse (125152513042), we get a palindrome (365467764563).

The spelling of 240315251521 in words is "two hundred forty billion, three hundred fifteen million, two hundred fifty-one thousand, five hundred twenty-one".