1163533121 has 4 divisors (see below), whose sum is σ = 1163981700. Its totient is φ = 1163084544.

The previous prime is 1163533109. The next prime is 1163533141. The reversal of 1163533121 is 1213353611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 873852721 + 289680400 = 29561^2 + 17020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1163533121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1163533141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220376 + ... + 225593.

It is an arithmetic number, because the mean of its divisors is an integer number (290995425).

Almost surely, 2^1163533121 is an apocalyptic number.

It is an amenable number.

1163533121 is a deficient number, since it is larger than the sum of its proper divisors (448579).

1163533121 is an equidigital number, since it uses as much as digits as its factorization.

1163533121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448578.

The product of its digits is 1620, while the sum is 26.

The square root of 1163533121 is about 34110.6012993028. The cubic root of 1163533121 is about 1051.7832497034.

Adding to 1163533121 its reverse (1213353611), we get a palindrome (2376886732).

The spelling of 1163533121 in words is "one billion, one hundred sixty-three million, five hundred thirty-three thousand, one hundred twenty-one".