12820901 has 4 divisors (see below), whose sum is σ = 12828192. Its totient is φ = 12813612.

The previous prime is 12820891. The next prime is 12820909. The reversal of 12820901 is 10902821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12820901 - 2¹⁸ = 12558757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820909) 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 3 ways as a sum of consecutive naturals, for example, 800 + ... + 5126.

It is an arithmetic number, because the mean of its divisors is an integer number (3207048).

Almost surely, 2^12820901 is an apocalyptic number.

It is an amenable number.

12820901 is a deficient number, since it is larger than the sum of its proper divisors (7291).

12820901 is an equidigital number, since it uses as much as digits as its factorization.

12820901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 12820901 is about 3580.6285761022. The cubic root of 12820901 is about 234.0486725159.

The spelling of 12820901 in words is "twelve million, eight hundred twenty thousand, nine hundred one".