1231255 has 4 divisors (see below), whose sum is σ = 1477512. Its totient is φ = 985000.

The previous prime is 1231247. The next prime is 1231261. The reversal of 1231255 is 5521321.

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

It is not a de Polignac number, because 1231255 - 2³ = 1231247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123121 + ... + 123130.

It is an arithmetic number, because the mean of its divisors is an integer number (369378).

2^1231255 is an apocalyptic number.

1231255 is a deficient number, since it is larger than the sum of its proper divisors (246257).

1231255 is an equidigital number, since it uses as much as digits as its factorization.

1231255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246256.

The product of its digits is 300, while the sum is 19.

The square root of 1231255 is about 1109.6193040859. The cubic root of 1231255 is about 107.1805552000.

Adding to 1231255 its reverse (5521321), we get a palindrome (6752576).

It can be divided in two parts, 123 and 1255, that added together give a triangular number (1378 = T₅₂).

The spelling of 1231255 in words is "one million, two hundred thirty-one thousand, two hundred fifty-five".