1280817331 has 4 divisors (see below), whose sum is σ = 1281806152. Its totient is φ = 1279828512.

The previous prime is 1280817323. The next prime is 1280817337. The reversal of 1280817331 is 1337180821.

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 1280817331 - 2³ = 1280817323 is a prime.

It is a super-3 number, since 3×1280817331³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280817337) 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, 492465 + ... + 495058.

It is an arithmetic number, because the mean of its divisors is an integer number (320451538).

Almost surely, 2^1280817331 is an apocalyptic number.

1280817331 is a deficient number, since it is larger than the sum of its proper divisors (988821).

1280817331 is an equidigital number, since it uses as much as digits as its factorization.

1280817331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988820.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 1280817331 is about 35788.5083651163. The cubic root of 1280817331 is about 1085.9980993063.

The spelling of 1280817331 in words is "one billion, two hundred eighty million, eight hundred seventeen thousand, three hundred thirty-one".