12981481 has 2 divisors, whose sum is σ = 12981482. Its totient is φ = 12981480.

The previous prime is 12981439. The next prime is 12981491. The reversal of 12981481 is 18418921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10758400 + 2223081 = 3280^2 + 1491^2 .

It is a cyclic number.

It is not a de Polignac number, because 12981481 - 2¹¹ = 12979433 is a prime.

It is a super-2 number, since 2×12981481² = 337037697906722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12981431) 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 as a sum of consecutive naturals, namely, 6490740 + 6490741.

It is an arithmetic number, because the mean of its divisors is an integer number (6490741).

Almost surely, 2^12981481 is an apocalyptic number.

It is an amenable number.

12981481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12981481 is an equidigital number, since it uses as much as digits as its factorization.

12981481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 34.

The square root of 12981481 is about 3602.9822369809. The cubic root of 12981481 is about 235.0217634892.

The spelling of 12981481 in words is "twelve million, nine hundred eighty-one thousand, four hundred eighty-one".