1181445361 has 2 divisors, whose sum is σ = 1181445362. Its totient is φ = 1181445360.

The previous prime is 1181445283. The next prime is 1181445389. The reversal of 1181445361 is 1635441811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767567025 + 413878336 = 27705^2 + 20344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181445361 - 2¹⁵ = 1181412593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1181449361) 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, 590722680 + 590722681.

It is an arithmetic number, because the mean of its divisors is an integer number (590722681).

Almost surely, 2^1181445361 is an apocalyptic number.

It is an amenable number.

1181445361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181445361 is an equidigital number, since it uses as much as digits as its factorization.

1181445361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 1181445361 is about 34372.1596790193. The cubic root of 1181445361 is about 1057.1530824631.

It can be divided in two parts, 11814 and 45361, that added together give a palindrome (57175).

The spelling of 1181445361 in words is "one billion, one hundred eighty-one million, four hundred forty-five thousand, three hundred sixty-one".