12981667 has 2 divisors, whose sum is σ = 12981668. Its totient is φ = 12981666.

The previous prime is 12981649. The next prime is 12981679. The reversal of 12981667 is 76618921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12981667 - 2⁷ = 12981539 is a prime.

It is not a weakly prime, because it can be changed into another prime (12981167) 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, 6490833 + 6490834.

It is an arithmetic number, because the mean of its divisors is an integer number (6490834).

Almost surely, 2^12981667 is an apocalyptic number.

12981667 is a deficient number, since it is larger than the sum of its proper divisors (1).

12981667 is an equidigital number, since it uses as much as digits as its factorization.

12981667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 12981667 is about 3603.0080488392. The cubic root of 12981667 is about 235.0228859558.

It can be divided in two parts, 129 and 81667, that added together give a square (81796 = 286²).

The spelling of 12981667 in words is "twelve million, nine hundred eighty-one thousand, six hundred sixty-seven".