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1318 = 2659

1318 has 4 divisors (see below), whose sum is σ = 1980. Its totient is φ = 658.

The previous prime is 1307. The next prime is 1319. The reversal of 1318 is 8131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8131 = 47173.

It is a plaindrome in base 8 and base 15.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1298 and 1307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319) by changing a digit.

1318 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328 + ... + 331.

It is an arithmetic number, because the mean of its divisors is an integer number (495).

21318 is an apocalyptic number.

1318 is a deficient number, since it is larger than the sum of its proper divisors (662).

1318 is an equidigital number, since it uses as much as digits as its factorization.

1318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its digits is 24, while the sum is 13.

The square root of 1318 is about 36.3042697213. The cubic root of 1318 is about 10.9640700958.

Adding to 1318 its sum of digits (13), we get a palindrome (1331).

Adding to 1318 its reverse (8131), we get a palindrome (9449).

The spelling of 1318 in words is "one thousand, three hundred eighteen".

Divisors: 1 2 659 1318