12891547 has 2 divisors, whose sum is σ = 12891548. Its totient is φ = 12891546.

The previous prime is 12891533. The next prime is 12891553. The reversal of 12891547 is 74519821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12891547 - 2¹⁹ = 12367259 is a prime.

It is not a weakly prime, because it can be changed into another prime (12891517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445773 + 6445774.

It is an arithmetic number, because the mean of its divisors is an integer number (6445774).

Almost surely, 2^12891547 is an apocalyptic number.

12891547 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891547 is an equidigital number, since it uses as much as digits as its factorization.

12891547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 12891547 is about 3590.4800514694. The cubic root of 12891547 is about 234.4777719834.

The spelling of 12891547 in words is "twelve million, eight hundred ninety-one thousand, five hundred forty-seven".