1311855 has 16 divisors (see below), whose sum is σ = 2209920. Its totient is φ = 662688.

The previous prime is 1311853. The next prime is 1311857. The reversal of 1311855 is 5581131.

It is an interprime number because it is at equal distance from previous prime (1311853) and next prime (1311857).

It is not a de Polignac number, because 1311855 - 2¹ = 1311853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2017 + ... + 2586.

It is an arithmetic number, because the mean of its divisors is an integer number (138120).

2^1311855 is an apocalyptic number.

1311855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1311855 is a deficient number, since it is larger than the sum of its proper divisors (898065).

1311855 is a wasteful number, since it uses less digits than its factorization.

1311855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630.

The product of its digits is 600, while the sum is 24.

The square root of 1311855 is about 1145.3623880676. The cubic root of 1311855 is about 109.4700403848.

Adding to 1311855 its reverse (5581131), we get a palindrome (6892986).

The spelling of 1311855 in words is "one million, three hundred eleven thousand, eight hundred fifty-five".