1181917361 has 2 divisors, whose sum is σ = 1181917362. Its totient is φ = 1181917360.

The previous prime is 1181917357. The next prime is 1181917397. The reversal of 1181917361 is 1637191811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1044582400 + 137334961 = 32320^2 + 11719^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181917361 - 2² = 1181917357 is a prime.

It is not a weakly prime, because it can be changed into another prime (1181917661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590958680 + 590958681.

It is an arithmetic number, because the mean of its divisors is an integer number (590958681).

Almost surely, 2^1181917361 is an apocalyptic number.

It is an amenable number.

1181917361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181917361 is an equidigital number, since it uses as much as digits as its factorization.

1181917361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 38.

The square root of 1181917361 is about 34379.0250152618. The cubic root of 1181917361 is about 1057.2938450232.

The spelling of 1181917361 in words is "one billion, one hundred eighty-one million, nine hundred seventeen thousand, three hundred sixty-one".