129318568 has 8 divisors (see below), whose sum is σ = 242472330. Its totient is φ = 64659280.

The previous prime is 129318559. The next prime is 129318583. The reversal of 129318568 is 865813921.

It can be written as a sum of positive squares in only one way, i.e., 125484804 + 3833764 = 11202^2 + 1958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8082403 + ... + 8082418.

Almost surely, 2^129318568 is an apocalyptic number.

129318568 is the 6079-th centered heptagonal number.

It is an amenable number.

129318568 is a deficient number, since it is larger than the sum of its proper divisors (113153762).

129318568 is a wasteful number, since it uses less digits than its factorization.

129318568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16164827 (or 16164823 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 129318568 is about 11371.8322182487. The cubic root of 129318568 is about 505.6930236125.

The spelling of 129318568 in words is "one hundred twenty-nine million, three hundred eighteen thousand, five hundred sixty-eight".