18319117 has 4 divisors (see below), whose sum is σ = 18334720. Its totient is φ = 18303516.

The previous prime is 18319069. The next prime is 18319123. The reversal of 18319117 is 71191381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71191381 = 251 ⋅283631.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18319117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18319417) 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, 5883 + ... + 8440.

It is an arithmetic number, because the mean of its divisors is an integer number (4583680).

Almost surely, 2^18319117 is an apocalyptic number.

It is an amenable number.

18319117 is a deficient number, since it is larger than the sum of its proper divisors (15603).

18319117 is a wasteful number, since it uses less digits than its factorization.

18319117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15602.

The product of its digits is 1512, while the sum is 31.

The square root of 18319117 is about 4280.0837608626. The cubic root of 18319117 is about 263.6138226215.

The spelling of 18319117 in words is "eighteen million, three hundred nineteen thousand, one hundred seventeen".