1312217281 has 2 divisors, whose sum is σ = 1312217282. Its totient is φ = 1312217280.

The previous prime is 1312217279. The next prime is 1312217287. The reversal of 1312217281 is 1827122131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 870545025 + 441672256 = 29505^2 + 21016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312217281 - 2¹ = 1312217279 is a prime.

It is a super-2 number, since 2×1312217281² = 3443828385110065922, which contains 22 as substring.

Together with 1312217279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1312217287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656108640 + 656108641.

It is an arithmetic number, because the mean of its divisors is an integer number (656108641).

Almost surely, 2^1312217281 is an apocalyptic number.

It is an amenable number.

1312217281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312217281 is an equidigital number, since it uses as much as digits as its factorization.

1312217281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 1312217281 is about 36224.5397624318. The cubic root of 1312217281 is about 1094.8011651507.

It can be divided in two parts, 13122 and 17281, that added together give a palindrome (30403).

The spelling of 1312217281 in words is "one billion, three hundred twelve million, two hundred seventeen thousand, two hundred eighty-one".