1181531106 has 48 divisors (see below), whose sum is σ = 2930616000. Its totient is φ = 337012704.

The previous prime is 1181531083. The next prime is 1181531119. The reversal of 1181531106 is 6011351811.

It is a happy number.

1181531106 is a `hidden beast` number, since 118 + 1 + 531 + 10 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1181531106.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 70420 + ... + 85568.

It is an arithmetic number, because the mean of its divisors is an integer number (61054500).

Almost surely, 2^1181531106 is an apocalyptic number.

1181531106 is an abundant number, since it is smaller than the sum of its proper divisors (1749084894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1181531106 is a wasteful number, since it uses less digits than its factorization.

1181531106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15783 (or 15780 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 1181531106 is about 34373.4069594505. The cubic root of 1181531106 is about 1057.1786566175.

Adding to 1181531106 its reverse (6011351811), we get a palindrome (7192882917).

The spelling of 1181531106 in words is "one billion, one hundred eighty-one million, five hundred thirty-one thousand, one hundred six".