12757891 has 2 divisors, whose sum is σ = 12757892. Its totient is φ = 12757890.

The previous prime is 12757861. The next prime is 12757897. The reversal of 12757891 is 19875721.

It is a strong prime.

It is an emirp because it is prime and its reverse (19875721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12757891 - 2¹¹ = 12755843 is a prime.

It is not a weakly prime, because it can be changed into another prime (12757897) 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, 6378945 + 6378946.

It is an arithmetic number, because the mean of its divisors is an integer number (6378946).

Almost surely, 2^12757891 is an apocalyptic number.

12757891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12757891 is an equidigital number, since it uses as much as digits as its factorization.

12757891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 40.

The square root of 12757891 is about 3571.8190043730. The cubic root of 12757891 is about 233.6646217020.

The spelling of 12757891 in words is "twelve million, seven hundred fifty-seven thousand, eight hundred ninety-one".