1311705 has 24 divisors (see below), whose sum is σ = 2303808. Its totient is φ = 690336.

The previous prime is 1311701. The next prime is 1311721. The reversal of 1311705 is 5071131.

It is a happy number.

It is not a de Polignac number, because 1311705 - 2² = 1311701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4494 + ... + 4776.

It is an arithmetic number, because the mean of its divisors is an integer number (95992).

2^1311705 is an apocalyptic number.

1311705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311705 is a deficient number, since it is larger than the sum of its proper divisors (992103).

1311705 is a wasteful number, since it uses less digits than its factorization.

1311705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 105, while the sum is 18.

The square root of 1311705 is about 1145.2969047369. The cubic root of 1311705 is about 109.4658678881.

Adding to 1311705 its reverse (5071131), we get a palindrome (6382836).

It can be divided in two parts, 1311 and 705, that added together give a triangular number (2016 = T₆₃).

The spelling of 1311705 in words is "one million, three hundred eleven thousand, seven hundred five".