12491123 has 4 divisors (see below), whose sum is σ = 12498648. Its totient is φ = 12483600.

The previous prime is 12491071. The next prime is 12491131. The reversal of 12491123 is 32119421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12491123 - 2¹⁰ = 12490099 is a prime.

It is a super-2 number, since 2×12491123² = 312056307602258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12491023) 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, 53 + ... + 4998.

It is an arithmetic number, because the mean of its divisors is an integer number (3124662).

Almost surely, 2^12491123 is an apocalyptic number.

12491123 is a deficient number, since it is larger than the sum of its proper divisors (7525).

12491123 is an equidigital number, since it uses as much as digits as its factorization.

12491123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7524.

The product of its digits is 432, while the sum is 23.

The square root of 12491123 is about 3534.2782855910. The cubic root of 12491123 is about 232.0244908252.

The spelling of 12491123 in words is "twelve million, four hundred ninety-one thousand, one hundred twenty-three".