1131211443 has 32 divisors (see below), whose sum is σ = 1567641600. Its totient is φ = 725100800.

The previous prime is 1131211441. The next prime is 1131211453. The reversal of 1131211443 is 3441121311.

It is a cyclic number.

It is not a de Polignac number, because 1131211443 - 2¹ = 1131211441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131211441) 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 31 ways as a sum of consecutive naturals, for example, 4205113 + ... + 4205381.

It is an arithmetic number, because the mean of its divisors is an integer number (48988800).

Almost surely, 2^1131211443 is an apocalyptic number.

1131211443 is a deficient number, since it is larger than the sum of its proper divisors (436430157).

1131211443 is a wasteful number, since it uses less digits than its factorization.

1131211443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683.

The product of its digits is 288, while the sum is 21.

The square root of 1131211443 is about 33633.4869289522. The cubic root of 1131211443 is about 1041.9525212825.

Adding to 1131211443 its reverse (3441121311), we get a palindrome (4572332754).

The spelling of 1131211443 in words is "one billion, one hundred thirty-one million, two hundred eleven thousand, four hundred forty-three".