129331669 has 4 divisors (see below), whose sum is σ = 129545344. Its totient is φ = 129117996.

The previous prime is 129331667. The next prime is 129331693. The reversal of 129331669 is 966133921.

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: 966133921 = 61 ⋅15838261.

It is a cyclic number.

It is not a de Polignac number, because 129331669 - 2¹ = 129331667 is a prime.

It is a super-2 number, since 2×129331669² = 33453361212651122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129331663) 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, 105927 + ... + 107140.

It is an arithmetic number, because the mean of its divisors is an integer number (32386336).

Almost surely, 2^129331669 is an apocalyptic number.

It is an amenable number.

129331669 is a deficient number, since it is larger than the sum of its proper divisors (213675).

129331669 is an equidigital number, since it uses as much as digits as its factorization.

129331669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213674.

The product of its digits is 52488, while the sum is 40.

The square root of 129331669 is about 11372.4082322083. The cubic root of 129331669 is about 505.7100999450.

The spelling of 129331669 in words is "one hundred twenty-nine million, three hundred thirty-one thousand, six hundred sixty-nine".