12124509 has 4 divisors (see below), whose sum is σ = 16166016. Its totient is φ = 8083004.

The previous prime is 12124487. The next prime is 12124513. The reversal of 12124509 is 90542121.

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: 90542121 = 3 ⋅30180707.

It is a cyclic number.

It is not a de Polignac number, because 12124509 - 2¹³ = 12116317 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12124529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020749 + ... + 2020754.

It is an arithmetic number, because the mean of its divisors is an integer number (4041504).

Almost surely, 2^12124509 is an apocalyptic number.

It is an amenable number.

12124509 is a deficient number, since it is larger than the sum of its proper divisors (4041507).

12124509 is an equidigital number, since it uses as much as digits as its factorization.

12124509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4041506.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 12124509 is about 3482.0265650911. The cubic root of 12124509 is about 229.7319435401.

The spelling of 12124509 in words is "twelve million, one hundred twenty-four thousand, five hundred nine".