1181768321 has 2 divisors, whose sum is σ = 1181768322. Its totient is φ = 1181768320.

The previous prime is 1181768317. The next prime is 1181768339. The reversal of 1181768321 is 1238671811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657358321 + 524410000 = 25639^2 + 22900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181768321 - 2² = 1181768317 is a prime.

It is not a weakly prime, because it can be changed into another prime (1181764321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590884160 + 590884161.

It is an arithmetic number, because the mean of its divisors is an integer number (590884161).

Almost surely, 2^1181768321 is an apocalyptic number.

It is an amenable number.

1181768321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181768321 is an equidigital number, since it uses as much as digits as its factorization.

1181768321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 38.

The square root of 1181768321 is about 34376.8573461857. The cubic root of 1181768321 is about 1057.2494015046.

The spelling of 1181768321 in words is "one billion, one hundred eighty-one million, seven hundred sixty-eight thousand, three hundred twenty-one".