1311865 has 8 divisors (see below), whose sum is σ = 1601280. Its totient is φ = 1031472.

The previous prime is 1311857. The next prime is 1311899. The reversal of 1311865 is 5681131.

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 1311865 - 2³ = 1311857 is a prime.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1929 + ... + 2518.

It is an arithmetic number, because the mean of its divisors is an integer number (200160).

2^1311865 is an apocalyptic number.

It is an amenable number.

1311865 is a deficient number, since it is larger than the sum of its proper divisors (289415).

1311865 is an equidigital number, since it uses as much as digits as its factorization.

1311865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511.

The product of its digits is 720, while the sum is 25.

The square root of 1311865 is about 1145.3667534899. The cubic root of 1311865 is about 109.4703185400.

Adding to 1311865 its reverse (5681131), we get a palindrome (6992996).

The spelling of 1311865 in words is "one million, three hundred eleven thousand, eight hundred sixty-five".