1091143 has 4 divisors (see below), whose sum is σ = 1138608. Its totient is φ = 1043680.

The previous prime is 1091137. The next prime is 1091147. The reversal of 1091143 is 3411901.

It is a happy number.

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-1091143 is a prime.

It is a Duffinian number.

1091143 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1091143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091147) 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, 23698 + ... + 23743.

It is an arithmetic number, because the mean of its divisors is an integer number (284652).

2^1091143 is an apocalyptic number.

1091143 is a deficient number, since it is larger than the sum of its proper divisors (47465).

1091143 is an equidigital number, since it uses as much as digits as its factorization.

1091143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47464.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1091143 is about 1044.5779051847. The cubic root of 1091143 is about 102.9502068685.

The spelling of 1091143 in words is "one million, ninety-one thousand, one hundred forty-three".