1806531841 has 4 divisors (see below), whose sum is σ = 1811708500. Its totient is φ = 1801355184.

The previous prime is 1806531833. The next prime is 1806531847. The reversal of 1806531841 is 1481356081.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1607609025 + 198922816 = 40095^2 + 14104^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806531841 - 2³ = 1806531833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1806531841.

It is not an unprimeable number, because it can be changed into a prime (1806531847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2587806 + ... + 2588503.

It is an arithmetic number, because the mean of its divisors is an integer number (452927125).

Almost surely, 2^1806531841 is an apocalyptic number.

It is an amenable number.

1806531841 is a deficient number, since it is larger than the sum of its proper divisors (5176659).

1806531841 is an equidigital number, since it uses as much as digits as its factorization.

1806531841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5176658.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 1806531841 is about 42503.3156471351. The cubic root of 1806531841 is about 1217.9100294125.

The spelling of 1806531841 in words is "one billion, eight hundred six million, five hundred thirty-one thousand, eight hundred forty-one".