12149509 has 4 divisors (see below), whose sum is σ = 12864204. Its totient is φ = 11434816.

The previous prime is 12149507. The next prime is 12149513. The reversal of 12149509 is 90594121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90594121 = 31 ⋅2922391.

It can be written as a sum of positive squares in 2 ways, for example, as 10745284 + 1404225 = 3278^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 12149509 - 2¹ = 12149507 is a prime.

It is a super-2 number, since 2×12149509² = 295221137882162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12149507) 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, 357322 + ... + 357355.

It is an arithmetic number, because the mean of its divisors is an integer number (3216051).

Almost surely, 2^12149509 is an apocalyptic number.

It is an amenable number.

12149509 is a deficient number, since it is larger than the sum of its proper divisors (714695).

12149509 is an equidigital number, since it uses as much as digits as its factorization.

12149509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714694.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 12149509 is about 3485.6145799557. The cubic root of 12149509 is about 229.8897329033.

The spelling of 12149509 in words is "twelve million, one hundred forty-nine thousand, five hundred nine".