12887640391 has 2 divisors, whose sum is σ = 12887640392. Its totient is φ = 12887640390.

The previous prime is 12887640361. The next prime is 12887640401. The reversal of 12887640391 is 19304678821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12887640391 - 2²¹ = 12885543239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12887640361) 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, 6443820195 + 6443820196.

It is an arithmetic number, because the mean of its divisors is an integer number (6443820196).

Almost surely, 2^12887640391 is an apocalyptic number.

12887640391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12887640391 is an equidigital number, since it uses as much as digits as its factorization.

12887640391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 12887640391 in words is "twelve billion, eight hundred eighty-seven million, six hundred forty thousand, three hundred ninety-one".