12981613 has 2 divisors, whose sum is σ = 12981614. Its totient is φ = 12981612.

The previous prime is 12981611. The next prime is 12981623. The reversal of 12981613 is 31618921.

12981613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12981609 + 4 = 3603^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 12981613 - 2¹ = 12981611 is a prime.

Together with 12981611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12981611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6490806 + 6490807.

It is an arithmetic number, because the mean of its divisors is an integer number (6490807).

Almost surely, 2^12981613 is an apocalyptic number.

It is an amenable number.

12981613 is a deficient number, since it is larger than the sum of its proper divisors (1).

12981613 is an equidigital number, since it uses as much as digits as its factorization.

12981613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The square root of 12981613 is about 3603.0005550929. Note that the first 3 decimals coincide. The cubic root of 12981613 is about 235.0225600795.

The spelling of 12981613 in words is "twelve million, nine hundred eighty-one thousand, six hundred thirteen".