12891530551 has 2 divisors, whose sum is σ = 12891530552. Its totient is φ = 12891530550.

The previous prime is 12891530543. The next prime is 12891530599. The reversal of 12891530551 is 15503519821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12891530551 - 2³ = 12891530543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12891530251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445765275 + 6445765276.

It is an arithmetic number, because the mean of its divisors is an integer number (6445765276).

Almost surely, 2^12891530551 is an apocalyptic number.

12891530551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891530551 is an equidigital number, since it uses as much as digits as its factorization.

12891530551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 40.

The spelling of 12891530551 in words is "twelve billion, eight hundred ninety-one million, five hundred thirty thousand, five hundred fifty-one".