12765439091 has 2 divisors, whose sum is σ = 12765439092. Its totient is φ = 12765439090.

The previous prime is 12765439087. The next prime is 12765439097. The reversal of 12765439091 is 19093456721.

12765439091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12765439091 - 2² = 12765439087 is a prime.

It is not a weakly prime, because it can be changed into another prime (12765439097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6382719545 + 6382719546.

It is an arithmetic number, because the mean of its divisors is an integer number (6382719546).

Almost surely, 2^12765439091 is an apocalyptic number.

12765439091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12765439091 is an equidigital number, since it uses as much as digits as its factorization.

12765439091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 12765439091 in words is "twelve billion, seven hundred sixty-five million, four hundred thirty-nine thousand, ninety-one".