1155123173 has 2 divisors, whose sum is σ = 1155123174. Its totient is φ = 1155123172.

The previous prime is 1155123139. The next prime is 1155123187. The reversal of 1155123173 is 3713215511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 836250724 + 318872449 = 28918^2 + 17857^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155123173 - 2¹⁴ = 1155106789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155123103) 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, 577561586 + 577561587.

It is an arithmetic number, because the mean of its divisors is an integer number (577561587).

Almost surely, 2^1155123173 is an apocalyptic number.

It is an amenable number.

1155123173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155123173 is an equidigital number, since it uses as much as digits as its factorization.

1155123173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 29.

The square root of 1155123173 is about 33987.1030392412. The cubic root of 1155123173 is about 1049.2430441542.

Adding to 1155123173 its reverse (3713215511), we get a palindrome (4868338684).

The spelling of 1155123173 in words is "one billion, one hundred fifty-five million, one hundred twenty-three thousand, one hundred seventy-three".