1131444111 has 16 divisors (see below), whose sum is σ = 1726919424. Its totient is φ = 645484224.

The previous prime is 1131444109. The next prime is 1131444173. The reversal of 1131444111 is 1114441311.

It is not a de Polignac number, because 1131444111 - 2¹ = 1131444109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131444191) 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, 30705 + ... + 56618.

It is an arithmetic number, because the mean of its divisors is an integer number (107932464).

Almost surely, 2^1131444111 is an apocalyptic number.

1131444111 is a deficient number, since it is larger than the sum of its proper divisors (595475313).

1131444111 is an equidigital number, since it uses as much as digits as its factorization.

1131444111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87950.

The product of its digits is 192, while the sum is 21.

The square root of 1131444111 is about 33636.9456253091. The cubic root of 1131444111 is about 1042.0239527824.

Adding to 1131444111 its reverse (1114441311), we get a palindrome (2245885422).

The spelling of 1131444111 in words is "one billion, one hundred thirty-one million, four hundred forty-four thousand, one hundred eleven".