129079312447 has 2 divisors, whose sum is σ = 129079312448. Its totient is φ = 129079312446.

The previous prime is 129079312441. The next prime is 129079312477. The reversal of 129079312447 is 744213970921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129079312447 is a prime.

It is a super-2 number, since 2×129079312447² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129079312447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129079312441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64539656223 + 64539656224.

It is an arithmetic number, because the mean of its divisors is an integer number (64539656224).

Almost surely, 2^129079312447 is an apocalyptic number.

129079312447 is a deficient number, since it is larger than the sum of its proper divisors (1).

129079312447 is an equidigital number, since it uses as much as digits as its factorization.

129079312447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 129079312447 in words is "one hundred twenty-nine billion, seventy-nine million, three hundred twelve thousand, four hundred forty-seven".