12911123 has 2 divisors, whose sum is σ = 12911124. Its totient is φ = 12911122.

The previous prime is 12911117. The next prime is 12911161. The reversal of 12911123 is 32111921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12911123 - 2⁸ = 12910867 is a prime.

It is a super-4 number, since 4×12911123⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 12911095 and 12911104.

It is not a weakly prime, because it can be changed into another prime (12911623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6455561 + 6455562.

It is an arithmetic number, because the mean of its divisors is an integer number (6455562).

Almost surely, 2^12911123 is an apocalyptic number.

12911123 is a deficient number, since it is larger than the sum of its proper divisors (1).

12911123 is an equidigital number, since it uses as much as digits as its factorization.

12911123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 20.

The square root of 12911123 is about 3593.2051152140. The cubic root of 12911123 is about 234.5963979177.

The spelling of 12911123 in words is "twelve million, nine hundred eleven thousand, one hundred twenty-three".