1173111123 has 4 divisors (see below), whose sum is σ = 1564148168. Its totient is φ = 782074080.

The previous prime is 1173111109. The next prime is 1173111131. The reversal of 1173111123 is 3211113711.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1173111123 - 2⁶ = 1173111059 is a prime.

It is a super-2 number, since 2×1173111123² = 2752379413812642258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1173111123.

It is not an unprimeable number, because it can be changed into a prime (1173111143) 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, 195518518 + ... + 195518523.

It is an arithmetic number, because the mean of its divisors is an integer number (391037042).

Almost surely, 2^1173111123 is an apocalyptic number.

1173111123 is a deficient number, since it is larger than the sum of its proper divisors (391037045).

1173111123 is an equidigital number, since it uses as much as digits as its factorization.

1173111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391037044.

The product of its digits is 126, while the sum is 21.

The square root of 1173111123 is about 34250.7098174622. The cubic root of 1173111123 is about 1054.6613987913.

Adding to 1173111123 its reverse (3211113711), we get a palindrome (4384224834).

The spelling of 1173111123 in words is "one billion, one hundred seventy-three million, one hundred eleven thousand, one hundred twenty-three".