129269717 has 4 divisors (see below), whose sum is σ = 136873836. Its totient is φ = 121665600.

The previous prime is 129269713. The next prime is 129269719. The reversal of 129269717 is 717962921.

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 116942596 + 12327121 = 10814^2 + 3511^2 .

It is not a de Polignac number, because 129269717 - 2² = 129269713 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129269713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3802034 + ... + 3802067.

It is an arithmetic number, because the mean of its divisors is an integer number (34218459).

Almost surely, 2^129269717 is an apocalyptic number.

129269717 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

129269717 is a deficient number, since it is larger than the sum of its proper divisors (7604119).

129269717 is an equidigital number, since it uses as much as digits as its factorization.

129269717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7604118.

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

The square root of 129269717 is about 11369.6841205022. The cubic root of 129269717 is about 505.6293392255.

The spelling of 129269717 in words is "one hundred twenty-nine million, two hundred sixty-nine thousand, seven hundred seventeen".