1280308613 has 4 divisors (see below), whose sum is σ = 1280383020. Its totient is φ = 1280234208.

The previous prime is 1280308609. The next prime is 1280308619. The reversal of 1280308613 is 3168030821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3168030821 = 2341 ⋅1353281.

It can be written as a sum of positive squares in 2 ways, for example, as 650148004 + 630160609 = 25498^2 + 25103^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280308613 - 2² = 1280308609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280308613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280308619) 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, 3323 + ... + 50711.

It is an arithmetic number, because the mean of its divisors is an integer number (320095755).

Almost surely, 2^1280308613 is an apocalyptic number.

It is an amenable number.

1280308613 is a deficient number, since it is larger than the sum of its proper divisors (74407).

1280308613 is an equidigital number, since it uses as much as digits as its factorization.

1280308613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74406.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1280308613 is about 35781.4003778499. The cubic root of 1280308613 is about 1085.8543005180.

The spelling of 1280308613 in words is "one billion, two hundred eighty million, three hundred eight thousand, six hundred thirteen".