1155161444 has 6 divisors (see below), whose sum is σ = 2021532534. Its totient is φ = 577580720.

The previous prime is 1155161443. The next prime is 1155161473. The reversal of 1155161444 is 4441615511.

It can be written as a sum of positive squares in only one way, i.e., 1146635044 + 8526400 = 33862^2 + 2920^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1155161444.

It is not an unprimeable number, because it can be changed into a prime (1155161443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144395177 + ... + 144395184.

It is an arithmetic number, because the mean of its divisors is an integer number (336922089).

Almost surely, 2^1155161444 is an apocalyptic number.

It is an amenable number.

1155161444 is a deficient number, since it is larger than the sum of its proper divisors (866371090).

1155161444 is a wasteful number, since it uses less digits than its factorization.

1155161444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288790365 (or 288790363 counting only the distinct ones).

The product of its digits is 9600, while the sum is 32.

The square root of 1155161444 is about 33987.6660569684. Note that the first 3 decimals coincide. The cubic root of 1155161444 is about 1049.2546317026.

Adding to 1155161444 its reverse (4441615511), we get a palindrome (5596776955).

The spelling of 1155161444 in words is "one billion, one hundred fifty-five million, one hundred sixty-one thousand, four hundred forty-four".