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1255 = 5251

1255 has 4 divisors (see below), whose sum is σ = 1512. Its totient is φ = 1000.

The previous prime is 1249. The next prime is 1259. The reversal of 1255 is 5521.

1255 is nontrivially palindromic in base 13.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1255 - 25 = 1223 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 1 + 54 + 22 + 54 .

It is a Duffinian number.

1255 is an undulating number in base 13.

It is a partition number, being equal to the number of ways a set of 23 identical objects can be partitioned into subset.

It is a plaindrome in base 8, base 10 and base 15.

It is a nialpdrome in base 11 and base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121 + ... + 130.

It is an arithmetic number, because the mean of its divisors is an integer number (378).

1255 is a Friedman number, since it can be written as 251*5, using all its digits and the basic arithmetic operations.

1255 is a deficient number, since it is larger than the sum of its proper divisors (257).

1255 is an equidigital number, since it uses as much as digits as its factorization.

1255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256.

The product of its digits is 50, while the sum is 13.

The square root of 1255 is about 35.4259791678. The cubic root of 1255 is about 10.7865172400.

Adding to 1255 its reverse (5521), we get a palindrome (6776).

It can be divided in two parts, 125 and 5, that multiplied together give a 4-th power (625 = 54).

The spelling of 1255 in words is "one thousand, two hundred fifty-five".

Divisors: 1 5 251 1255