1089871 has 4 divisors (see below), whose sum is σ = 1095712. Its totient is φ = 1084032.

The previous prime is 1089863. The next prime is 1089877. The reversal of 1089871 is 1789801.

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 1089871 - 2³ = 1089863 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 (1089877) 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, 2631 + ... + 3016.

It is an arithmetic number, because the mean of its divisors is an integer number (273928).

2^1089871 is an apocalyptic number.

1089871 is a deficient number, since it is larger than the sum of its proper divisors (5841).

1089871 is an equidigital number, since it uses as much as digits as its factorization.

1089871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1089871 is about 1043.9688692677. The cubic root of 1089871 is about 102.9101865772.

The spelling of 1089871 in words is "one million, eighty-nine thousand, eight hundred seventy-one".