1223123113 has 4 divisors (see below), whose sum is σ = 1223587840. Its totient is φ = 1222658388.

The previous prime is 1223123107. The next prime is 1223123137. The reversal of 1223123113 is 3113213221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3113213221 = 3257 ⋅955853.

It is a cyclic number.

It is not a de Polignac number, because 1223123113 - 2⁹ = 1223122601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223120113) 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, 228393 + ... + 233686.

It is an arithmetic number, because the mean of its divisors is an integer number (305896960).

Almost surely, 2^1223123113 is an apocalyptic number.

It is an amenable number.

1223123113 is a deficient number, since it is larger than the sum of its proper divisors (464727).

1223123113 is an equidigital number, since it uses as much as digits as its factorization.

1223123113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464726.

The product of its digits is 216, while the sum is 19.

The square root of 1223123113 is about 34973.1770504197. The cubic root of 1223123113 is about 1069.4407398542.

Adding to 1223123113 its reverse (3113213221), we get a palindrome (4336336334).

It can be divided in two parts, 1223123 and 113, that added together give a square (1223236 = 1106²).

The spelling of 1223123113 in words is "one billion, two hundred twenty-three million, one hundred twenty-three thousand, one hundred thirteen".