129961667 has 12 divisors (see below), whose sum is σ = 143649576. Its totient is φ = 116593920.

The previous prime is 129961631. The next prime is 129961679. The reversal of 129961667 is 766169921.

It is a de Polignac number, because none of the positive numbers 2^k-129961667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129961687) 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 11 ways as a sum of consecutive naturals, for example, 372209 + ... + 372557.

It is an arithmetic number, because the mean of its divisors is an integer number (11970798).

Almost surely, 2^129961667 is an apocalyptic number.

129961667 is a deficient number, since it is larger than the sum of its proper divisors (13687909).

129961667 is an frugal number, since it uses more digits than its factorization.

129961667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 457 counting only the distinct ones).

The product of its digits is 244944, while the sum is 47.

The square root of 129961667 is about 11400.0731138006. The cubic root of 129961667 is about 506.5299054263.

The spelling of 129961667 in words is "one hundred twenty-nine million, nine hundred sixty-one thousand, six hundred sixty-seven".