1311895 has 8 divisors (see below), whose sum is σ = 1695456. Its totient is φ = 968736.

The previous prime is 1311857. The next prime is 1311899. The reversal of 1311895 is 5981131.

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 1311895 - 2⁷ = 1311767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311899) 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, 10027 + ... + 10156.

It is an arithmetic number, because the mean of its divisors is an integer number (211932).

2^1311895 is an apocalyptic number.

1311895 is a deficient number, since it is larger than the sum of its proper divisors (383561).

1311895 is a wasteful number, since it uses less digits than its factorization.

1311895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20201.

The product of its digits is 1080, while the sum is 28.

The square root of 1311895 is about 1145.3798496569. The cubic root of 1311895 is about 109.4711529969.

The spelling of 1311895 in words is "one million, three hundred eleven thousand, eight hundred ninety-five".