12906389491 has 2 divisors, whose sum is σ = 12906389492. Its totient is φ = 12906389490.

The previous prime is 12906389473. The next prime is 12906389519. The reversal of 12906389491 is 19498360921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12906389491 is a prime.

It is not a weakly prime, because it can be changed into another prime (12906389401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6453194745 + 6453194746.

It is an arithmetic number, because the mean of its divisors is an integer number (6453194746).

Almost surely, 2^12906389491 is an apocalyptic number.

12906389491 is a deficient number, since it is larger than the sum of its proper divisors (1).

12906389491 is an equidigital number, since it uses as much as digits as its factorization.

12906389491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 12906389491 in words is "twelve billion, nine hundred six million, three hundred eighty-nine thousand, four hundred ninety-one".