It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a Duffinian number.
1309 is a lucky number.
It is a plaindrome in base 13.
It is a nialpdrome in base 11 and base 12.
It is a congruent number.
It is an amenable number.
1309 is a wasteful number, since it uses less digits than its factorization.
1309 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 35.
The square root of 1309 is about 36.1801050303. The cubic root of 1309 is about 10.9390569212.
Subtracting from 1309 its sum of digits (13), we obtain a 4-th power (1296 = 64).
The spelling of 1309 in words is "one thousand, three hundred nine".