1191131228428 has 48 divisors (see below), whose sum is σ = 2103265402560. Its totient is φ = 590226038784.

The previous prime is 1191131228423. The next prime is 1191131228429. The reversal of 1191131228428 is 8248221311911.

It is not an unprimeable number, because it can be changed into a prime (1191131228423) 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, 280066350 + ... + 280070602.

It is an arithmetic number, because the mean of its divisors is an integer number (43818029220).

Almost surely, 2^{1191131228428} is an apocalyptic number.

It is an amenable number.

1191131228428 is a deficient number, since it is larger than the sum of its proper divisors (912134174132).

1191131228428 is a wasteful number, since it uses less digits than its factorization.

1191131228428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5746 (or 5744 counting only the distinct ones).

The product of its digits is 55296, while the sum is 43.

The spelling of 1191131228428 in words is "one trillion, one hundred ninety-one billion, one hundred thirty-one million, two hundred twenty-eight thousand, four hundred twenty-eight".