515840241361 has 4 divisors (see below), whose sum is σ = 522055184112. Its totient is φ = 509625298612.

The previous prime is 515840241359. The next prime is 515840241373. The reversal of 515840241361 is 163142048515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 163142048515 = 5 ⋅32628409703.

It is a cyclic number.

It is not a de Polignac number, because 515840241361 - 2¹ = 515840241359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (515870241361) 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, 3107471251 + ... + 3107471416.

It is an arithmetic number, because the mean of its divisors is an integer number (130513796028).

Almost surely, 2^515840241361 is an apocalyptic number.

It is an amenable number.

515840241361 is a deficient number, since it is larger than the sum of its proper divisors (6214942751).

515840241361 is an equidigital number, since it uses as much as digits as its factorization.

515840241361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6214942750.

The product of its (nonzero) digits is 115200, while the sum is 40.

Adding to 515840241361 its reverse (163142048515), we get a palindrome (678982289876).

The spelling of 515840241361 in words is "five hundred fifteen billion, eight hundred forty million, two hundred forty-one thousand, three hundred sixty-one".