18313319 has 4 divisors (see below), whose sum is σ = 18322560. Its totient is φ = 18304080.

The previous prime is 18313307. The next prime is 18313327. The reversal of 18313319 is 91331381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91331381 = 337 ⋅271013.

It is a cyclic number.

It is not a de Polignac number, because 18313319 - 2⁴ = 18313303 is a prime.

It is a super-2 number, since 2×18313319² = 670755305591522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18313291 and 18313300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18312319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302 + ... + 6059.

It is an arithmetic number, because the mean of its divisors is an integer number (4580640).

It is a self-describing number.

Almost surely, 2^18313319 is an apocalyptic number.

18313319 is a deficient number, since it is larger than the sum of its proper divisors (9241).

18313319 is an equidigital number, since it uses as much as digits as its factorization.

18313319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9240.

The product of its digits is 1944, while the sum is 29.

The square root of 18313319 is about 4279.4063840678. The cubic root of 18313319 is about 263.5860084311.

The spelling of 18313319 in words is "eighteen million, three hundred thirteen thousand, three hundred nineteen".