12857881 has 2 divisors, whose sum is σ = 12857882. Its totient is φ = 12857880.

The previous prime is 12857857. The next prime is 12857891. The reversal of 12857881 is 18875821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8410000 + 4447881 = 2900^2 + 2109^2 .

It is an emirp because it is prime and its reverse (18875821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12857881 - 2¹¹ = 12855833 is a prime.

It is a super-3 number, since 3×12857881³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12857891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428940 + 6428941.

It is an arithmetic number, because the mean of its divisors is an integer number (6428941).

Almost surely, 2^12857881 is an apocalyptic number.

It is an amenable number.

12857881 is a deficient number, since it is larger than the sum of its proper divisors (1).

12857881 is an equidigital number, since it uses as much as digits as its factorization.

12857881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 40.

The square root of 12857881 is about 3585.7887556296. The cubic root of 12857881 is about 234.2734828145.

The spelling of 12857881 in words is "twelve million, eight hundred fifty-seven thousand, eight hundred eighty-one".