1123121123 has 2 divisors, whose sum is σ = 1123121124. Its totient is φ = 1123121122.

The previous prime is 1123121107. The next prime is 1123121143. The reversal of 1123121123 is 3211213211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1123121123 - 2⁴ = 1123121107 is a prime.

It is a super-2 number, since 2×1123121123² = 2522802113857562258, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1123121143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561560561 + 561560562.

It is an arithmetic number, because the mean of its divisors is an integer number (561560562).

Almost surely, 2^1123121123 is an apocalyptic number.

1123121123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123121123 is an equidigital number, since it uses as much as digits as its factorization.

1123121123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 1123121123 is about 33512.9993136992. Note that the first 3 decimals coincide. The cubic root of 1123121123 is about 1039.4625930966.

Adding to 1123121123 its reverse (3211213211), we get a palindrome (4334334334).

The spelling of 1123121123 in words is "one billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred twenty-three".