129659669 has 2 divisors, whose sum is σ = 129659670. Its totient is φ = 129659668.

The previous prime is 129659653. The next prime is 129659681. The reversal of 129659669 is 966956921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75047569 + 54612100 = 8663^2 + 7390^2 .

It is a cyclic number.

It is not a de Polignac number, because 129659669 - 2⁴ = 129659653 is a prime.

It is a super-2 number, since 2×129659669² = 33623259530379122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129659669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129659689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64829834 + 64829835.

It is an arithmetic number, because the mean of its divisors is an integer number (64829835).

Almost surely, 2^129659669 is an apocalyptic number.

It is an amenable number.

129659669 is a deficient number, since it is larger than the sum of its proper divisors (1).

129659669 is an equidigital number, since it uses as much as digits as its factorization.

129659669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 53.

The square root of 129659669 is about 11386.8199687182. The cubic root of 129659669 is about 506.1372520546.

The spelling of 129659669 in words is "one hundred twenty-nine million, six hundred fifty-nine thousand, six hundred sixty-nine".