1143124991 has 4 divisors (see below), whose sum is σ = 1143196512. Its totient is φ = 1143053472.

The previous prime is 1143124903. The next prime is 1143125017. The reversal of 1143124991 is 1994213411.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1994213411 = 7027 ⋅283793.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143124991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143124901) 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 3 ways as a sum of consecutive naturals, for example, 410 + ... + 47816.

It is an arithmetic number, because the mean of its divisors is an integer number (285799128).

Almost surely, 2^1143124991 is an apocalyptic number.

1143124991 is a deficient number, since it is larger than the sum of its proper divisors (71521).

1143124991 is an equidigital number, since it uses as much as digits as its factorization.

1143124991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71520.

The product of its digits is 7776, while the sum is 35.

The square root of 1143124991 is about 33810.1314845122. The cubic root of 1143124991 is about 1045.5975889559.

The spelling of 1143124991 in words is "one billion, one hundred forty-three million, one hundred twenty-four thousand, nine hundred ninety-one".