12840551 has 2 divisors, whose sum is σ = 12840552. Its totient is φ = 12840550.

The previous prime is 12840547. The next prime is 12840571. The reversal of 12840551 is 15504821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12840551 - 2² = 12840547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12840551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12840571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420275 + 6420276.

It is an arithmetic number, because the mean of its divisors is an integer number (6420276).

Almost surely, 2^12840551 is an apocalyptic number.

12840551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840551 is an equidigital number, since it uses as much as digits as its factorization.

12840551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 12840551 is about 3583.3714571615. The cubic root of 12840551 is about 234.1681833268.

The spelling of 12840551 in words is "twelve million, eight hundred forty thousand, five hundred fifty-one".