12731551 has 16 divisors (see below), whose sum is σ = 15321600. Its totient is φ = 10348128.

The previous prime is 12731549. The next prime is 12731557. The reversal of 12731551 is 15513721.

It is not a de Polignac number, because 12731551 - 2¹ = 12731549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731557) 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 15 ways as a sum of consecutive naturals, for example, 11446 + ... + 12508.

It is an arithmetic number, because the mean of its divisors is an integer number (957600).

Almost surely, 2^12731551 is an apocalyptic number.

12731551 is a deficient number, since it is larger than the sum of its proper divisors (2590049).

12731551 is a wasteful number, since it uses less digits than its factorization.

12731551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158.

The product of its digits is 1050, while the sum is 25.

The square root of 12731551 is about 3568.1299023438. The cubic root of 12731551 is about 233.5037025581.

The spelling of 12731551 in words is "twelve million, seven hundred thirty-one thousand, five hundred fifty-one".