12909515447 has 2 divisors, whose sum is σ = 12909515448. Its totient is φ = 12909515446.

The previous prime is 12909515429. The next prime is 12909515449. The reversal of 12909515447 is 74451590921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12909515447 - 2⁸ = 12909515191 is a prime.

Together with 12909515449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12909515449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6454757723 + 6454757724.

It is an arithmetic number, because the mean of its divisors is an integer number (6454757724).

Almost surely, 2^12909515447 is an apocalyptic number.

12909515447 is a deficient number, since it is larger than the sum of its proper divisors (1).

12909515447 is an equidigital number, since it uses as much as digits as its factorization.

12909515447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 12909515447 in words is "twelve billion, nine hundred nine million, five hundred fifteen thousand, four hundred forty-seven".