129203017 has 2 divisors, whose sum is σ = 129203018. Its totient is φ = 129203016.

The previous prime is 129202987. The next prime is 129203027. The reversal of 129203017 is 710302921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124077321 + 5125696 = 11139^2 + 2264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129203017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129202982 and 129203000.

It is not a weakly prime, because it can be changed into another prime (129203027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64601508 + 64601509.

It is an arithmetic number, because the mean of its divisors is an integer number (64601509).

Almost surely, 2^129203017 is an apocalyptic number.

It is an amenable number.

129203017 is a deficient number, since it is larger than the sum of its proper divisors (1).

129203017 is an equidigital number, since it uses as much as digits as its factorization.

129203017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 129203017 is about 11366.7505031121. The cubic root of 129203017 is about 505.5423601560.

Adding to 129203017 its reverse (710302921), we get a palindrome (839505938).

It can be divided in two parts, 12 and 9203017, that added together give a palindrome (9203029).

The spelling of 129203017 in words is "one hundred twenty-nine million, two hundred three thousand, seventeen".