1081855 has 4 divisors (see below), whose sum is σ = 1298232. Its totient is φ = 865480.

The previous prime is 1081853. The next prime is 1081859. The reversal of 1081855 is 5581801.

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

It is not a de Polignac number, because 1081855 - 2¹ = 1081853 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 (1081853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108181 + ... + 108190.

It is an arithmetic number, because the mean of its divisors is an integer number (324558).

2^1081855 is an apocalyptic number.

1081855 is a deficient number, since it is larger than the sum of its proper divisors (216377).

1081855 is an equidigital number, since it uses as much as digits as its factorization.

1081855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216376.

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 1081855 is about 1040.1225889288. The cubic root of 1081855 is about 102.6572640421.

It can be divided in two parts, 1081 and 855, that added together give a square (1936 = 44²).

The spelling of 1081855 in words is "one million, eighty-one thousand, eight hundred fifty-five".