12820481 has 2 divisors, whose sum is σ = 12820482. Its totient is φ = 12820480.

The previous prime is 12820427. The next prime is 12820487. The reversal of 12820481 is 18402821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11282881 + 1537600 = 3359^2 + 1240^2 .

It is an emirp because it is prime and its reverse (18402821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12820481 is a prime.

It is a super-2 number, since 2×12820481² = 328729466142722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12820481.

It is not a weakly prime, because it can be changed into another prime (12820487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410240 + 6410241.

It is an arithmetic number, because the mean of its divisors is an integer number (6410241).

It is a Proth number, since it is equal to 1565 ⋅ 2¹³ + 1 and 1565 < 2¹³.

Almost surely, 2^12820481 is an apocalyptic number.

It is an amenable number.

12820481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820481 is an equidigital number, since it uses as much as digits as its factorization.

12820481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 12820481 is about 3580.5699267016. The cubic root of 12820481 is about 234.0461167538.

The spelling of 12820481 in words is "twelve million, eight hundred twenty thousand, four hundred eighty-one".