12981643 has 2 divisors, whose sum is σ = 12981644. Its totient is φ = 12981642.

The previous prime is 12981623. The next prime is 12981649. The reversal of 12981643 is 34618921.

It is a strong prime.

It is an emirp because it is prime and its reverse (34618921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12981643 - 2⁵ = 12981611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12981599 and 12981608.

It is not a weakly prime, because it can be changed into another prime (12981649) 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, 6490821 + 6490822.

It is an arithmetic number, because the mean of its divisors is an integer number (6490822).

Almost surely, 2^12981643 is an apocalyptic number.

12981643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12981643 is an equidigital number, since it uses as much as digits as its factorization.

12981643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 12981643 is about 3603.0047182872. The cubic root of 12981643 is about 235.0227411220.

Subtracting from 12981643 its sum of digits (34), we obtain a square (12981609 = 3603²).

The spelling of 12981643 in words is "twelve million, nine hundred eighty-one thousand, six hundred forty-three".