12731553 has 8 divisors (see below), whose sum is σ = 18861600. Its totient is φ = 8487684.

The previous prime is 12731549. The next prime is 12731557. The reversal of 12731553 is 35513721.

It is an interprime number because it is at equal distance from previous prime (12731549) and next prime (12731557).

It is not a de Polignac number, because 12731553 - 2² = 12731549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 471539 = 12731553 / (1 + 2 + 7 + 3 + 1 + 5 + 5 + 3).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12731557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235743 + ... + 235796.

It is an arithmetic number, because the mean of its divisors is an integer number (2357700).

Almost surely, 2^12731553 is an apocalyptic number.

It is an amenable number.

12731553 is a deficient number, since it is larger than the sum of its proper divisors (6130047).

12731553 is an equidigital number, since it uses as much as digits as its factorization.

12731553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471548 (or 471542 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 12731553 is about 3568.1301826026. The cubic root of 12731553 is about 233.5037147851.

The spelling of 12731553 in words is "twelve million, seven hundred thirty-one thousand, five hundred fifty-three".