129063217 has 4 divisors (see below), whose sum is σ = 129088036. Its totient is φ = 129038400.

The previous prime is 129063163. The next prime is 129063227. The reversal of 129063217 is 712360921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91412721 + 37650496 = 9561^2 + 6136^2 .

It is a cyclic number.

It is not a de Polignac number, because 129063217 - 2⁷ = 129063089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129063227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1284 + ... + 16117.

It is an arithmetic number, because the mean of its divisors is an integer number (32272009).

Almost surely, 2^129063217 is an apocalyptic number.

It is an amenable number.

129063217 is a deficient number, since it is larger than the sum of its proper divisors (24819).

129063217 is an equidigital number, since it uses as much as digits as its factorization.

129063217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24818.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 129063217 is about 11360.5993239793. The cubic root of 129063217 is about 505.3599590289.

The spelling of 129063217 in words is "one hundred twenty-nine million, sixty-three thousand, two hundred seventeen".