12928780391 has 2 divisors, whose sum is σ = 12928780392. Its totient is φ = 12928780390.

The previous prime is 12928780367. The next prime is 12928780457. The reversal of 12928780391 is 19308782921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12928780391 - 2⁶ = 12928780327 is a prime.

It is a super-2 number, since 2×12928780391² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12928780321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6464390195 + 6464390196.

It is an arithmetic number, because the mean of its divisors is an integer number (6464390196).

Almost surely, 2^12928780391 is an apocalyptic number.

12928780391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12928780391 is an equidigital number, since it uses as much as digits as its factorization.

12928780391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 12928780391 in words is "twelve billion, nine hundred twenty-eight million, seven hundred eighty thousand, three hundred ninety-one".