1280245759 has 4 divisors (see below), whose sum is σ = 1378726216. Its totient is φ = 1181765304.

The previous prime is 1280245753. The next prime is 1280245763. The reversal of 1280245759 is 9575420821.

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

It is a cyclic number.

It is not a de Polignac number, because 1280245759 - 2²¹ = 1278148607 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 (1280245753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49240209 + ... + 49240234.

It is an arithmetic number, because the mean of its divisors is an integer number (344681554).

Almost surely, 2^1280245759 is an apocalyptic number.

1280245759 is a deficient number, since it is larger than the sum of its proper divisors (98480457).

1280245759 is an equidigital number, since it uses as much as digits as its factorization.

1280245759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98480456.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 1280245759 is about 35780.5220615910. The cubic root of 1280245759 is about 1085.8365309994.

The spelling of 1280245759 in words is "one billion, two hundred eighty million, two hundred forty-five thousand, seven hundred fifty-nine".