1173156161 has 2 divisors, whose sum is σ = 1173156162. Its totient is φ = 1173156160.

The previous prime is 1173156139. The next prime is 1173156167. The reversal of 1173156161 is 1616513711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1150498561 + 22657600 = 33919^2 + 4760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1173156161 - 2¹⁸ = 1172894017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1173156167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586578080 + 586578081.

It is an arithmetic number, because the mean of its divisors is an integer number (586578081).

Almost surely, 2^1173156161 is an apocalyptic number.

It is an amenable number.

1173156161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1173156161 is an equidigital number, since it uses as much as digits as its factorization.

1173156161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 32.

The square root of 1173156161 is about 34251.3672865770. The cubic root of 1173156161 is about 1054.6748954474.

Adding to 1173156161 its reverse (1616513711), we get a palindrome (2789669872).

The spelling of 1173156161 in words is "one billion, one hundred seventy-three million, one hundred fifty-six thousand, one hundred sixty-one".