1311943 has 4 divisors (see below), whose sum is σ = 1369008. Its totient is φ = 1254880.

The previous prime is 1311923. The next prime is 1311967. The reversal of 1311943 is 3491131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3491131 = 7 ⋅498733.

It is not a de Polignac number, because 1311943 - 2¹³ = 1303751 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311923) 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, 28498 + ... + 28543.

It is an arithmetic number, because the mean of its divisors is an integer number (342252).

2^1311943 is an apocalyptic number.

1311943 is a deficient number, since it is larger than the sum of its proper divisors (57065).

1311943 is an equidigital number, since it uses as much as digits as its factorization.

1311943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57064.

The product of its digits is 324, while the sum is 22.

The square root of 1311943 is about 1145.4008032126. The cubic root of 1311943 is about 109.4724881015.

The spelling of 1311943 in words is "one million, three hundred eleven thousand, nine hundred forty-three".