12909553 has 4 divisors (see below), whose sum is σ = 13354740. Its totient is φ = 12464368.

The previous prime is 12909551. The next prime is 12909557. The reversal of 12909553 is 35590921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5253264 + 7656289 = 2292^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 12909553 - 2¹ = 12909551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12909551) 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, 222550 + ... + 222607.

It is an arithmetic number, because the mean of its divisors is an integer number (3338685).

Almost surely, 2^12909553 is an apocalyptic number.

It is an amenable number.

12909553 is a deficient number, since it is larger than the sum of its proper divisors (445187).

12909553 is an equidigital number, since it uses as much as digits as its factorization.

12909553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445186.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 12909553 is about 3592.9866406654. The cubic root of 12909553 is about 234.5868885132.

The spelling of 12909553 in words is "twelve million, nine hundred nine thousand, five hundred fifty-three".