129064817 has 4 divisors (see below), whose sum is σ = 147502656. Its totient is φ = 110626980.

The previous prime is 129064807. The next prime is 129064841. The reversal of 129064817 is 718460921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 718460921 = 24107 ⋅29803.

It is a cyclic number.

It is not a de Polignac number, because 129064817 - 2¹⁰ = 129063793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129064807) 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 in 3 ways as a sum of consecutive naturals, for example, 9218909 + ... + 9218922.

It is an arithmetic number, because the mean of its divisors is an integer number (36875664).

Almost surely, 2^129064817 is an apocalyptic number.

It is an amenable number.

129064817 is a deficient number, since it is larger than the sum of its proper divisors (18437839).

129064817 is an equidigital number, since it uses as much as digits as its factorization.

129064817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18437838.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 129064817 is about 11360.6697425812. The cubic root of 129064817 is about 505.3620473404.

The spelling of 129064817 in words is "one hundred twenty-nine million, sixty-four thousand, eight hundred seventeen".