1311645 has 8 divisors (see below), whose sum is σ = 2098656. Its totient is φ = 699536.

The previous prime is 1311643. The next prime is 1311689. The reversal of 1311645 is 5461131.

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 1311645 - 2¹ = 1311643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43707 + ... + 43736.

It is an arithmetic number, because the mean of its divisors is an integer number (262332).

2^1311645 is an apocalyptic number.

1311645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311645 is a deficient number, since it is larger than the sum of its proper divisors (787011).

1311645 is an equidigital number, since it uses as much as digits as its factorization.

1311645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87451.

The product of its digits is 360, while the sum is 21.

The square root of 1311645 is about 1145.2707103563. The cubic root of 1311645 is about 109.4641988004.

Adding to 1311645 its reverse (5461131), we get a palindrome (6772776).

The spelling of 1311645 in words is "one million, three hundred eleven thousand, six hundred forty-five".