12891553 has 2 divisors, whose sum is σ = 12891554. Its totient is φ = 12891552.

The previous prime is 12891547. The next prime is 12891587. The reversal of 12891553 is 35519821.

It is an a-pointer prime, because the next prime (12891587) can be obtained adding 12891553 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7354944 + 5536609 = 2712^2 + 2353^2 .

It is an emirp because it is prime and its reverse (35519821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12891553 - 2⁵ = 12891521 is a prime.

It is not a weakly prime, because it can be changed into another prime (12891533) 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, 6445776 + 6445777.

It is an arithmetic number, because the mean of its divisors is an integer number (6445777).

Almost surely, 2^12891553 is an apocalyptic number.

It is an amenable number.

12891553 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891553 is an equidigital number, since it uses as much as digits as its factorization.

12891553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 12891553 is about 3590.4808870122. The cubic root of 12891553 is about 234.4778083603.

The spelling of 12891553 in words is "twelve million, eight hundred ninety-one thousand, five hundred fifty-three".