1091859 has 16 divisors (see below), whose sum is σ = 1566720. Its totient is φ = 673920.

The previous prime is 1091843. The next prime is 1091863. The reversal of 1091859 is 9581901.

It is not a de Polignac number, because 1091859 - 2⁴ = 1091843 is a prime.

1091859 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1091809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3894 + ... + 4164.

It is an arithmetic number, because the mean of its divisors is an integer number (97920).

2^1091859 is an apocalyptic number.

1091859 is a deficient number, since it is larger than the sum of its proper divisors (474861).

1091859 is a wasteful number, since it uses less digits than its factorization.

1091859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 1091859 is about 1044.9205711440. The cubic root of 1091859 is about 102.9727203339.

The spelling of 1091859 in words is "one million, ninety-one thousand, eight hundred fifty-nine".