129216797 has 2 divisors, whose sum is σ = 129216798. Its totient is φ = 129216796.

The previous prime is 129216757. The next prime is 129216821. The reversal of 129216797 is 797612921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123899161 + 5317636 = 11131^2 + 2306^2 .

It is a cyclic number.

It is not a de Polignac number, because 129216797 - 2¹⁴ = 129200413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129216757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64608398 + 64608399.

It is an arithmetic number, because the mean of its divisors is an integer number (64608399).

Almost surely, 2^129216797 is an apocalyptic number.

It is an amenable number.

129216797 is a deficient number, since it is larger than the sum of its proper divisors (1).

129216797 is an equidigital number, since it uses as much as digits as its factorization.

129216797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 44.

The square root of 129216797 is about 11367.3566408378. The cubic root of 129216797 is about 505.5603321978.

The spelling of 129216797 in words is "one hundred twenty-nine million, two hundred sixteen thousand, seven hundred ninety-seven".