129279896917 has 2 divisors, whose sum is σ = 129279896918. Its totient is φ = 129279896916.

The previous prime is 129279896903. The next prime is 129279896927. The reversal of 129279896917 is 719698972921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124020891556 + 5259005361 = 352166^2 + 72519^2 .

It is a cyclic number.

It is not a de Polignac number, because 129279896917 - 2⁷ = 129279896789 is a prime.

It is a super-2 number, since 2×129279896917² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129279896927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64639948458 + 64639948459.

It is an arithmetic number, because the mean of its divisors is an integer number (64639948459).

Almost surely, 2^129279896917 is an apocalyptic number.

It is an amenable number.

129279896917 is a deficient number, since it is larger than the sum of its proper divisors (1).

129279896917 is an equidigital number, since it uses as much as digits as its factorization.

129279896917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61725888, while the sum is 70.

The spelling of 129279896917 in words is "one hundred twenty-nine billion, two hundred seventy-nine million, eight hundred ninety-six thousand, nine hundred seventeen".