1131311121 has 8 divisors (see below), whose sum is σ = 1597145184. Its totient is φ = 709842240.

The previous prime is 1131311099. The next prime is 1131311161. The reversal of 1131311121 is 1211131311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1131311121 - 2¹³ = 1131302929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131311121.

It is not an unprimeable number, because it can be changed into a prime (1131311161) 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 7 ways as a sum of consecutive naturals, for example, 11091235 + ... + 11091336.

It is an arithmetic number, because the mean of its divisors is an integer number (199643148).

Almost surely, 2^1131311121 is an apocalyptic number.

It is an amenable number.

1131311121 is a deficient number, since it is larger than the sum of its proper divisors (465834063).

1131311121 is a wasteful number, since it uses less digits than its factorization.

1131311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22182591.

The product of its digits is 18, while the sum is 15.

The square root of 1131311121 is about 33634.9687230418. The cubic root of 1131311121 is about 1041.9831246661.

Adding to 1131311121 its reverse (1211131311), we get a palindrome (2342442432).

It can be divided in two parts, 1131311 and 121, that multiplied together give a palindrome (136888631).

The spelling of 1131311121 in words is "one billion, one hundred thirty-one million, three hundred eleven thousand, one hundred twenty-one".