1161121243 has 2 divisors, whose sum is σ = 1161121244. Its totient is φ = 1161121242.

The previous prime is 1161121211. The next prime is 1161121253. The reversal of 1161121243 is 3421211611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1161121243 - 2⁵ = 1161121211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161121253) 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, 580560621 + 580560622.

It is an arithmetic number, because the mean of its divisors is an integer number (580560622).

Almost surely, 2^1161121243 is an apocalyptic number.

1161121243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161121243 is an equidigital number, since it uses as much as digits as its factorization.

1161121243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 1161121243 is about 34075.2291701758. The cubic root of 1161121243 is about 1051.0560027591.

Adding to 1161121243 its reverse (3421211611), we get a palindrome (4582332854).

The spelling of 1161121243 in words is "one billion, one hundred sixty-one million, one hundred twenty-one thousand, two hundred forty-three".