1331143 has 4 divisors (see below), whose sum is σ = 1452168. Its totient is φ = 1210120.

The previous prime is 1331123. The next prime is 1331153. The reversal of 1331143 is 3411331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331143 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 (1331123) 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, 60496 + ... + 60517.

It is an arithmetic number, because the mean of its divisors is an integer number (363042).

2^1331143 is an apocalyptic number.

1331143 is a deficient number, since it is larger than the sum of its proper divisors (121025).

1331143 is a wasteful number, since it uses less digits than its factorization.

1331143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121024.

The product of its digits is 108, while the sum is 16.

The square root of 1331143 is about 1153.7517063909. The cubic root of 1331143 is about 110.0039392529.

Adding to 1331143 its reverse (3411331), we get a palindrome (4742474).

The spelling of 1331143 in words is "one million, three hundred thirty-one thousand, one hundred forty-three".