1320111281 has 2 divisors, whose sum is σ = 1320111282. Its totient is φ = 1320111280.

The previous prime is 1320111269. The next prime is 1320111301. The reversal of 1320111281 is 1821110231.

It is a happy number.

It is an a-pointer prime, because the next prime (1320111301) can be obtained adding 1320111281 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729864256 + 590247025 = 27016^2 + 24295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320111281 - 2¹⁸ = 1319849137 is a prime.

It is a super-2 number, since 2×1320111281² = 3485387588446921922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1320111181) 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 as a sum of consecutive naturals, namely, 660055640 + 660055641.

It is an arithmetic number, because the mean of its divisors is an integer number (660055641).

Almost surely, 2^1320111281 is an apocalyptic number.

It is an amenable number.

1320111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320111281 is an equidigital number, since it uses as much as digits as its factorization.

1320111281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 1320111281 is about 36333.3356712537. The cubic root of 1320111281 is about 1096.9921356182.

The spelling of 1320111281 in words is "one billion, three hundred twenty million, one hundred eleven thousand, two hundred eighty-one".