1251255 has 8 divisors (see below), whose sum is σ = 2002032. Its totient is φ = 667328.

The previous prime is 1251247. The next prime is 1251259. The reversal of 1251255 is 5521521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1251255 - 2³ = 1251247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41694 + ... + 41723.

It is an arithmetic number, because the mean of its divisors is an integer number (250254).

2^1251255 is an apocalyptic number.

1251255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1251255 is a deficient number, since it is larger than the sum of its proper divisors (750777).

1251255 is an equidigital number, since it uses as much as digits as its factorization.

1251255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83425.

The product of its digits is 500, while the sum is 21.

The square root of 1251255 is about 1118.5951010084. The cubic root of 1251255 is about 107.7577733171.

Adding to 1251255 its reverse (5521521), we get a palindrome (6772776).

The spelling of 1251255 in words is "one million, two hundred fifty-one thousand, two hundred fifty-five".