18311317 has 4 divisors (see below), whose sum is σ = 18432736. Its totient is φ = 18189900.

The previous prime is 18311291. The next prime is 18311323. The reversal of 18311317 is 71311381.

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.

It is a cyclic number.

It is not a de Polignac number, because 18311317 - 2¹⁵ = 18278549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18311291 and 18311300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311327) 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, 60483 + ... + 60784.

It is an arithmetic number, because the mean of its divisors is an integer number (4608184).

Almost surely, 2^18311317 is an apocalyptic number.

It is an amenable number.

18311317 is a deficient number, since it is larger than the sum of its proper divisors (121419).

18311317 is a wasteful number, since it uses less digits than its factorization.

18311317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121418.

The product of its digits is 504, while the sum is 25.

The square root of 18311317 is about 4279.1724667276. The cubic root of 18311317 is about 263.5764030647.

Adding to 18311317 its reverse (71311381), we get a palindrome (89622698).

The spelling of 18311317 in words is "eighteen million, three hundred eleven thousand, three hundred seventeen".