1163231161 has 2 divisors, whose sum is σ = 1163231162. Its totient is φ = 1163231160.

The previous prime is 1163231159. The next prime is 1163231207. The reversal of 1163231161 is 1611323611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1154640400 + 8590761 = 33980^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 1163231161 - 2¹ = 1163231159 is a prime.

Together with 1163231159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1163231101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 581615580 + 581615581.

It is an arithmetic number, because the mean of its divisors is an integer number (581615581).

Almost surely, 2^1163231161 is an apocalyptic number.

It is an amenable number.

1163231161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1163231161 is an equidigital number, since it uses as much as digits as its factorization.

1163231161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 1163231161 is about 34106.1748221638. The cubic root of 1163231161 is about 1051.6922556031.

Adding to 1163231161 its reverse (1611323611), we get a palindrome (2774554772).

It can be divided in two parts, 1163 and 231161, that added together give a square (232324 = 482²).

The spelling of 1163231161 in words is "one billion, one hundred sixty-three million, two hundred thirty-one thousand, one hundred sixty-one".