1311320281 has 2 divisors, whose sum is σ = 1311320282. Its totient is φ = 1311320280.

The previous prime is 1311320267. The next prime is 1311320291. The reversal of 1311320281 is 1820231131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 777294400 + 534025881 = 27880^2 + 23109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311320281 - 2¹¹ = 1311318233 is a prime.

It is a super-2 number, since 2×1311320281² = 3439121758723837922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1311320291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655660140 + 655660141.

It is an arithmetic number, because the mean of its divisors is an integer number (655660141).

Almost surely, 2^1311320281 is an apocalyptic number.

It is an amenable number.

1311320281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311320281 is an equidigital number, since it uses as much as digits as its factorization.

1311320281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1311320281 is about 36212.1565361689. The cubic root of 1311320281 is about 1094.5516484205.

The spelling of 1311320281 in words is "one billion, three hundred eleven million, three hundred twenty thousand, two hundred eighty-one".