1181281 has 2 divisors, whose sum is σ = 1181282. Its totient is φ = 1181280.

The previous prime is 1181269. The next prime is 1181293. The reversal of 1181281 is 1821811.

It is a balanced prime because it is at equal distance from previous prime (1181269) and next prime (1181293).

It can be written as a sum of positive squares in only one way, i.e., 839056 + 342225 = 916^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181281 - 2⁷ = 1181153 is a prime.

It is a super-2 number, since 2×1181281² = 2790849601922, which contains 22 as substring.

It is a Chen prime.

1181281 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1181581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590640 + 590641.

It is an arithmetic number, because the mean of its divisors is an integer number (590641).

2^1181281 is an apocalyptic number.

It is an amenable number.

1181281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181281 is an equidigital number, since it uses as much as digits as its factorization.

1181281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 22.

The square root of 1181281 is about 1086.8675172255. The cubic root of 1181281 is about 105.7104056978.

The spelling of 1181281 in words is "one million, one hundred eighty-one thousand, two hundred eighty-one".