129019717 has 2 divisors, whose sum is σ = 129019718. Its totient is φ = 129019716.

The previous prime is 129019669. The next prime is 129019739. The reversal of 129019717 is 717910921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109181601 + 19838116 = 10449^2 + 4454^2 .

It is a cyclic number.

It is not a de Polignac number, because 129019717 - 2⁷ = 129019589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129011717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64509858 + 64509859.

It is an arithmetic number, because the mean of its divisors is an integer number (64509859).

Almost surely, 2^129019717 is an apocalyptic number.

It is an amenable number.

129019717 is a deficient number, since it is larger than the sum of its proper divisors (1).

129019717 is an equidigital number, since it uses as much as digits as its factorization.

129019717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 37.

The square root of 129019717 is about 11358.6846509620. The cubic root of 129019717 is about 505.3031764460.

The spelling of 129019717 in words is "one hundred twenty-nine million, nineteen thousand, seven hundred seventeen".