1123139443 has 4 divisors (see below), whose sum is σ = 1124266960. Its totient is φ = 1122011928.

The previous prime is 1123139441. The next prime is 1123139467. The reversal of 1123139443 is 3449313211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3449313211 = 17981 ⋅191831.

It is a cyclic number.

It is not a de Polignac number, because 1123139443 - 2¹ = 1123139441 is a prime.

It is a super-2 number, since 2×1123139443² = 2522884416844700498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123139441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562263 + ... + 564256.

It is an arithmetic number, because the mean of its divisors is an integer number (281066740).

Almost surely, 2^1123139443 is an apocalyptic number.

1123139443 is a deficient number, since it is larger than the sum of its proper divisors (1127517).

1123139443 is an equidigital number, since it uses as much as digits as its factorization.

1123139443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127516.

The product of its digits is 7776, while the sum is 31.

The square root of 1123139443 is about 33513.2726393589. The cubic root of 1123139443 is about 1039.4682448620.

The spelling of 1123139443 in words is "one billion, one hundred twenty-three million, one hundred thirty-nine thousand, four hundred forty-three".