18319129 has 4 divisors (see below), whose sum is σ = 18508084. Its totient is φ = 18130176.

The previous prime is 18319123. The next prime is 18319141. The reversal of 18319129 is 92191381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8111104 + 10208025 = 2848^2 + 3195^2 .

It is a cyclic number.

It is not a de Polignac number, because 18319129 - 2⁹ = 18318617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18319094 and 18319103.

It is not an unprimeable number, because it can be changed into a prime (18319123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94332 + ... + 94525.

It is an arithmetic number, because the mean of its divisors is an integer number (4627021).

Almost surely, 2^18319129 is an apocalyptic number.

It is an amenable number.

18319129 is a deficient number, since it is larger than the sum of its proper divisors (188955).

18319129 is an equidigital number, since it uses as much as digits as its factorization.

18319129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188954.

The product of its digits is 3888, while the sum is 34.

The square root of 18319129 is about 4280.0851627041. The cubic root of 18319129 is about 263.6138801819.

The spelling of 18319129 in words is "eighteen million, three hundred nineteen thousand, one hundred twenty-nine".