12871009 has 2 divisors, whose sum is σ = 12871010. Its totient is φ = 12871008.

The previous prime is 12870973. The next prime is 12871021. The reversal of 12871009 is 90017821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11370384 + 1500625 = 3372^2 + 1225^2 .

It is an emirp because it is prime and its reverse (90017821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12871009 - 2⁹ = 12870497 is a prime.

It is a Chen prime.

It is equal to p₈₄₁₄₆₅ and since 12871009 and 841465 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12871049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6435504 + 6435505.

It is an arithmetic number, because the mean of its divisors is an integer number (6435505).

Almost surely, 2^12871009 is an apocalyptic number.

It is an amenable number.

12871009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12871009 is an equidigital number, since it uses as much as digits as its factorization.

12871009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 12871009 is about 3587.6188482056. The cubic root of 12871009 is about 234.3531873982.

The spelling of 12871009 in words is "twelve million, eight hundred seventy-one thousand, nine".