1281143 has 4 divisors (see below), whose sum is σ = 1297440. Its totient is φ = 1264848.

The previous prime is 1281131. The next prime is 1281149. The reversal of 1281143 is 3411821.

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 1281143 - 2⁸ = 1280887 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 (1281149) 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, 8030 + ... + 8187.

It is an arithmetic number, because the mean of its divisors is an integer number (324360).

2^1281143 is an apocalyptic number.

1281143 is a deficient number, since it is larger than the sum of its proper divisors (16297).

1281143 is an equidigital number, since it uses as much as digits as its factorization.

1281143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16296.

The product of its digits is 192, while the sum is 20.

The square root of 1281143 is about 1131.8758765872. The cubic root of 1281143 is about 108.6090135835.

Adding to 1281143 its reverse (3411821), we get a palindrome (4692964).

The spelling of 1281143 in words is "one million, two hundred eighty-one thousand, one hundred forty-three".