1123355789 has 4 divisors (see below), whose sum is σ = 1147257024. Its totient is φ = 1099454556.

The previous prime is 1123355777. The next prime is 1123355797. The reversal of 1123355789 is 9875533211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1123355789 - 2⁸ = 1123355533 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123355729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11950547 + ... + 11950640.

It is an arithmetic number, because the mean of its divisors is an integer number (286814256).

Almost surely, 2^1123355789 is an apocalyptic number.

It is an amenable number.

1123355789 is a deficient number, since it is larger than the sum of its proper divisors (23901235).

1123355789 is an equidigital number, since it uses as much as digits as its factorization.

1123355789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23901234.

The product of its digits is 226800, while the sum is 44.

The square root of 1123355789 is about 33516.5002498769. The cubic root of 1123355789 is about 1039.5349834907.

The spelling of 1123355789 in words is "one billion, one hundred twenty-three million, three hundred fifty-five thousand, seven hundred eighty-nine".