12261509 has 8 divisors (see below), whose sum is σ = 13232352. Its totient is φ = 11294640.

The previous prime is 12261503. The next prime is 12261521. The reversal of 12261509 is 90516221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12261509 - 2⁸ = 12261253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261503) 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 7 ways as a sum of consecutive naturals, for example, 9962 + ... + 11124.

It is an arithmetic number, because the mean of its divisors is an integer number (1654044).

Almost surely, 2^12261509 is an apocalyptic number.

It is an amenable number.

12261509 is a deficient number, since it is larger than the sum of its proper divisors (970843).

12261509 is a wasteful number, since it uses less digits than its factorization.

12261509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 12261509 is about 3501.6437568662. The cubic root of 12261509 is about 230.5939845385.

The spelling of 12261509 in words is "twelve million, two hundred sixty-one thousand, five hundred nine".