129668697 has 12 divisors (see below), whose sum is σ = 187711524. Its totient is φ = 86255520.

The previous prime is 129668663. The next prime is 129668717. The reversal of 129668697 is 796866921.

It can be written as a sum of positive squares in 2 ways, for example, as 60512841 + 69155856 = 7779^2 + 8316^2 .

It is not a de Polignac number, because 129668697 - 2⁷ = 129668569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129668797) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11478 + ... + 19775.

It is an arithmetic number, because the mean of its divisors is an integer number (15642627).

Almost surely, 2^129668697 is an apocalyptic number.

It is an amenable number.

129668697 is a deficient number, since it is larger than the sum of its proper divisors (58042827).

129668697 is a wasteful number, since it uses less digits than its factorization.

129668697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31720 (or 31717 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 129668697 is about 11387.2163850521. The cubic root of 129668697 is about 506.1489989637.

The spelling of 129668697 in words is "one hundred twenty-nine million, six hundred sixty-eight thousand, six hundred ninety-seven".