1263 has 4 divisors (see below), whose sum is σ = 1688.
Its totient is φ = 840.
The previous prime is 1259. The next prime is 1277. The reversal of 1263 is 3621.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 1263 - 22 = 1259 is a prime.
It is a D-number.
It is a Duffinian number.
1263 is a lucky number.
It is a plaindrome in base 8 and base 16.
It is a nialpdrome in base 13 and base 14.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1213) 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, 208 + ... + 213.
It is an arithmetic number, because the mean of its divisors is an integer number (422).
1263 is a deficient number, since it is larger than the sum of its proper divisors (425).
1263 is an equidigital number, since it uses as much as digits as its factorization.
1263 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 424.
The product of its digits is 36, while the sum is 12.
The square root of 1263 is about 35.5387112878.
The cubic root of 1263 is about 10.8093882700.
Adding to 1263 its sum of digits (12), we get a triangular number (1275 = T50).
Adding to 1263 its reverse (3621), we get a palindrome (4884).
It can be divided in two parts, 126 and 3, that multiplied together give a triangular number (378 = T27).
The spelling of 1263 in words is "one thousand, two hundred sixty-three".