1311995 has 4 divisors (see below), whose sum is σ = 1574400. Its totient is φ = 1049592.

The previous prime is 1311991. The next prime is 1312001. The reversal of 1311995 is 5991131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311995 - 2² = 1311991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131195 + ... + 131204.

It is an arithmetic number, because the mean of its divisors is an integer number (393600).

2^1311995 is an apocalyptic number.

1311995 is a deficient number, since it is larger than the sum of its proper divisors (262405).

1311995 is an equidigital number, since it uses as much as digits as its factorization.

1311995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262404.

The product of its digits is 1215, while the sum is 29.

The square root of 1311995 is about 1145.4235024654. The cubic root of 1311995 is about 109.4739344281.

The spelling of 1311995 in words is "one million, three hundred eleven thousand, nine hundred ninety-five".