12805081 has 2 divisors, whose sum is σ = 12805082. Its totient is φ = 12805080.

The previous prime is 12805073. The next prime is 12805087. The reversal of 12805081 is 18050821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 379456 = 3525^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 12805081 - 2³ = 12805073 is a prime.

It is a super-2 number, since 2×12805081² = 327940198833122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12805087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6402540 + 6402541.

It is an arithmetic number, because the mean of its divisors is an integer number (6402541).

Almost surely, 2^12805081 is an apocalyptic number.

It is an amenable number.

12805081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12805081 is an equidigital number, since it uses as much as digits as its factorization.

12805081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 12805081 is about 3578.4187848825. The cubic root of 12805081 is about 233.9523669085.

It can be divided in two parts, 1 and 2805081, that added together give a palindrome (2805082).

The spelling of 12805081 in words is "twelve million, eight hundred five thousand, eighty-one".