1155523161 has 16 divisors (see below), whose sum is σ = 1670356800. Its totient is φ = 706315200.

The previous prime is 1155523141. The next prime is 1155523163. The reversal of 1155523161 is 1613255511.

It is not a de Polignac number, because 1155523161 - 2⁹ = 1155522649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155523163) 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 in 15 ways as a sum of consecutive naturals, for example, 93615 + ... + 105236.

It is an arithmetic number, because the mean of its divisors is an integer number (104397300).

Almost surely, 2^1155523161 is an apocalyptic number.

It is an amenable number.

1155523161 is a deficient number, since it is larger than the sum of its proper divisors (514833639).

1155523161 is a wasteful number, since it uses less digits than its factorization.

1155523161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199016.

The product of its digits is 4500, while the sum is 30.

The square root of 1155523161 is about 33992.9869384848. The cubic root of 1155523161 is about 1049.3641383671.

Adding to 1155523161 its reverse (1613255511), we get a palindrome (2768778672).

It can be divided in two parts, 11555 and 23161, that added together give a triangular number (34716 = T₂₆₃).

The spelling of 1155523161 in words is "one billion, one hundred fifty-five million, five hundred twenty-three thousand, one hundred sixty-one".