1181281643 has 2 divisors, whose sum is σ = 1181281644. Its totient is φ = 1181281642.

The previous prime is 1181281609. The next prime is 1181281697. The reversal of 1181281643 is 3461821811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1181281643 - 2⁶ = 1181281579 is a prime.

It is not a weakly prime, because it can be changed into another prime (1183281643) 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, 590640821 + 590640822.

It is an arithmetic number, because the mean of its divisors is an integer number (590640822).

Almost surely, 2^1181281643 is an apocalyptic number.

1181281643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181281643 is an equidigital number, since it uses as much as digits as its factorization.

1181281643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 1181281643 is about 34369.7780469994. The cubic root of 1181281643 is about 1057.1042487804.

The spelling of 1181281643 in words is "one billion, one hundred eighty-one million, two hundred eighty-one thousand, six hundred forty-three".