12731549 has 2 divisors, whose sum is σ = 12731550. Its totient is φ = 12731548.

The previous prime is 12731533. The next prime is 12731557. The reversal of 12731549 is 94513721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7812025 + 4919524 = 2795^2 + 2218^2 .

It is a cyclic number.

It is not a de Polignac number, because 12731549 - 2⁴ = 12731533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12731599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6365774 + 6365775.

It is an arithmetic number, because the mean of its divisors is an integer number (6365775).

Almost surely, 2^12731549 is an apocalyptic number.

It is an amenable number.

12731549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12731549 is an equidigital number, since it uses as much as digits as its factorization.

12731549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 12731549 is about 3568.1296220849. The cubic root of 12731549 is about 233.5036903311.

The spelling of 12731549 in words is "twelve million, seven hundred thirty-one thousand, five hundred forty-nine".