1051805 has 4 divisors (see below), whose sum is σ = 1262172. Its totient is φ = 841440.

The previous prime is 1051789. The next prime is 1051811. The reversal of 1051805 is 5081501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5081501 = 223 ⋅22787.

It can be written as a sum of positive squares in 2 ways, for example, as 597529 + 454276 = 773^2 + 674^2 .

It is not a de Polignac number, because 1051805 - 2⁴ = 1051789 is a prime.

It is a super-2 number, since 2×1051805² = 2212587516050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105176 + ... + 105185.

It is an arithmetic number, because the mean of its divisors is an integer number (315543).

2^1051805 is an apocalyptic number.

It is an amenable number.

1051805 is a deficient number, since it is larger than the sum of its proper divisors (210367).

1051805 is an equidigital number, since it uses as much as digits as its factorization.

1051805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210366.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1051805 is about 1025.5754482241. The cubic root of 1051805 is about 101.6978434648.

It can be divided in two parts, 10 and 51805, that added together give a palindrome (51815).

The spelling of 1051805 in words is "one million, fifty-one thousand, eight hundred five".