129318993 has 12 divisors (see below), whose sum is σ = 190319220. Its totient is φ = 84585696.

The previous prime is 129318953. The next prime is 129319007. The reversal of 129318993 is 399813921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49449024 + 79869969 = 7032^2 + 8937^2 .

It is not a de Polignac number, because 129318993 - 2⁶ = 129318929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129318953) 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, 135078 + ... + 136031.

It is an arithmetic number, because the mean of its divisors is an integer number (15859935).

Almost surely, 2^129318993 is an apocalyptic number.

It is an amenable number.

129318993 is a deficient number, since it is larger than the sum of its proper divisors (61000227).

129318993 is a wasteful number, since it uses less digits than its factorization.

129318993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271168 (or 271165 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 129318993 is about 11371.8509047560. The cubic root of 129318993 is about 505.6935775915.

The spelling of 129318993 in words is "one hundred twenty-nine million, three hundred eighteen thousand, nine hundred ninety-three".