12911553 has 6 divisors (see below), whose sum is σ = 18650034. Its totient is φ = 8607696.

The previous prime is 12911543. The next prime is 12911611. The reversal of 12911553 is 35511921.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 294849 = 3552^2 + 543^2 .

It is not a de Polignac number, because 12911553 - 2¹⁰ = 12910529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12911543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 717300 + ... + 717317.

It is an arithmetic number, because the mean of its divisors is an integer number (3108339).

Almost surely, 2^12911553 is an apocalyptic number.

It is an amenable number.

12911553 is a deficient number, since it is larger than the sum of its proper divisors (5738481).

12911553 is a wasteful number, since it uses less digits than its factorization.

12911553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434623 (or 1434620 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 12911553 is about 3593.2649498750. The cubic root of 12911553 is about 234.5990022699.

The spelling of 12911553 in words is "twelve million, nine hundred eleven thousand, five hundred fifty-three".