129316023 has 12 divisors (see below), whose sum is σ = 189956520. Its totient is φ = 84749136.

The previous prime is 129316013. The next prime is 129316037. The reversal of 129316023 is 320613921.

129316023 is a `hidden beast` number, since 1 + 29 + 31 + 602 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-129316023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129316003) 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, 121236 + ... + 122297.

It is an arithmetic number, because the mean of its divisors is an integer number (15829710).

Almost surely, 2^129316023 is an apocalyptic number.

129316023 is a deficient number, since it is larger than the sum of its proper divisors (60640497).

129316023 is a wasteful number, since it uses less digits than its factorization.

129316023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243598 (or 243595 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 129316023 is about 11371.7203184039. The cubic root of 129316023 is about 505.6897062307.

Adding to 129316023 its reverse (320613921), we get a palindrome (449929944).

The spelling of 129316023 in words is "one hundred twenty-nine million, three hundred sixteen thousand, twenty-three".