1289080013 has 4 divisors (see below), whose sum is σ = 1388240028. Its totient is φ = 1189920000.

The previous prime is 1289080007. The next prime is 1289080021. The reversal of 1289080013 is 3100809821.

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 61418569 + 1227661444 = 7837^2 + 35038^2 .

It is a cyclic number.

It is not a de Polignac number, because 1289080013 - 2⁴ = 1289079997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289080033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49579988 + ... + 49580013.

It is an arithmetic number, because the mean of its divisors is an integer number (347060007).

Almost surely, 2^1289080013 is an apocalyptic number.

1289080013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1289080013 is a deficient number, since it is larger than the sum of its proper divisors (99160015).

1289080013 is an equidigital number, since it uses as much as digits as its factorization.

1289080013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99160014.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1289080013 is about 35903.7604297934. The cubic root of 1289080013 is about 1088.3283899714.

Adding to 1289080013 its reverse (3100809821), we get a palindrome (4389889834).

The spelling of 1289080013 in words is "one billion, two hundred eighty-nine million, eighty thousand, thirteen".