1181842721 has 2 divisors, whose sum is σ = 1181842722. Its totient is φ = 1181842720.

The previous prime is 1181842679. The next prime is 1181842733. The reversal of 1181842721 is 1272481811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1039159696 + 142683025 = 32236^2 + 11945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181842721 - 2⁶ = 1181842657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1181841721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590921360 + 590921361.

It is an arithmetic number, because the mean of its divisors is an integer number (590921361).

Almost surely, 2^1181842721 is an apocalyptic number.

It is an amenable number.

1181842721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181842721 is an equidigital number, since it uses as much as digits as its factorization.

1181842721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 35.

The square root of 1181842721 is about 34377.9394525035. The cubic root of 1181842721 is about 1057.2715879471.

The spelling of 1181842721 in words is "one billion, one hundred eighty-one million, eight hundred forty-two thousand, seven hundred twenty-one".