1161323243 has 2 divisors, whose sum is σ = 1161323244. Its totient is φ = 1161323242.

The previous prime is 1161323239. The next prime is 1161323257. The reversal of 1161323243 is 3423231611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1161323243 - 2² = 1161323239 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161323203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580661621 + 580661622.

It is an arithmetic number, because the mean of its divisors is an integer number (580661622).

Almost surely, 2^1161323243 is an apocalyptic number.

1161323243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161323243 is an equidigital number, since it uses as much as digits as its factorization.

1161323243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 1161323243 is about 34078.1930712296. The cubic root of 1161323243 is about 1051.1169498832.

Adding to 1161323243 its reverse (3423231611), we get a palindrome (4584554854).

The spelling of 1161323243 in words is "one billion, one hundred sixty-one million, three hundred twenty-three thousand, two hundred forty-three".