129718769 has 8 divisors (see below), whose sum is σ = 134429160. Its totient is φ = 125024256.

The previous prime is 129718759. The next prime is 129718783. The reversal of 129718769 is 967817921.

It can be written as a sum of positive squares in 4 ways, for example, as 214369 + 129504400 = 463^2 + 11380^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129718769 - 2¹⁶ = 129653233 is a prime.

It is a super-2 number, since 2×129718769² = 33653918061750722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129718709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14129 + ... + 21425.

It is an arithmetic number, because the mean of its divisors is an integer number (16803645).

Almost surely, 2^129718769 is an apocalyptic number.

It is an amenable number.

129718769 is a deficient number, since it is larger than the sum of its proper divisors (4710391).

129718769 is an equidigital number, since it uses as much as digits as its factorization.

129718769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7939.

The product of its digits is 381024, while the sum is 50.

The square root of 129718769 is about 11389.4147786442. The cubic root of 129718769 is about 506.2141409545.

The spelling of 129718769 in words is "one hundred twenty-nine million, seven hundred eighteen thousand, seven hundred sixty-nine".