260128513 has 4 divisors (see below), whose sum is σ = 260698180. Its totient is φ = 259558848.

The previous prime is 260128511. The next prime is 260128541. The reversal of 260128513 is 315821062.

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

It can be written as a sum of positive squares in 2 ways, for example, as 223562304 + 36566209 = 14952^2 + 6047^2 .

It is a cyclic number.

It is not a de Polignac number, because 260128513 - 2¹ = 260128511 is a prime.

It is the 16129-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260128511) by changing a digit.

It is a nontrivial repunit in base 16128.

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, 284148 + ... + 285061.

It is an arithmetic number, because the mean of its divisors is an integer number (65174545).

Almost surely, 2^260128513 is an apocalyptic number.

It is an amenable number.

260128513 is a deficient number, since it is larger than the sum of its proper divisors (569667).

260128513 is an equidigital number, since it uses as much as digits as its factorization.

260128513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569666.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 260128513 is about 16128.5000232508. The cubic root of 260128513 is about 638.3555708693.

Adding to 260128513 its reverse (315821062), we get a palindrome (575949575).

The spelling of 260128513 in words is "two hundred sixty million, one hundred twenty-eight thousand, five hundred thirteen".