1808205529 has 9 divisors (see below), whose sum is σ = 1958596479. Its totient is φ = 1668602520.

The previous prime is 1808205517. The next prime is 1808205533. The reversal of 1808205529 is 9255028081.

The square root of 1808205529 is 42523.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 267486025 + 1540719504 = 16355^2 + 39252^2 .

It is not a de Polignac number, because 1808205529 - 2¹³ = 1808197337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1808205491 and 1808205500.

It is not an unprimeable number, because it can be changed into a prime (1808205569) 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 8 ways as a sum of consecutive naturals, for example, 551164 + ... + 554434.

It is an arithmetic number, because the mean of its divisors is an integer number (217621831).

Almost surely, 2^1808205529 is an apocalyptic number.

1808205529 is the 42523-rd square number.

1808205529 is the 21262-nd centered octagonal number.

It is an amenable number.

1808205529 is a deficient number, since it is larger than the sum of its proper divisors (150390950).

1808205529 is an frugal number, since it uses more digits than its factorization.

1808205529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6568 (or 3284 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The cubic root of 1808205529 is about 1218.2860302071.

Multiplying 1808205529 by its product of nonzero digits (57600), we get a square (104152638470400 = 10205520²).

The spelling of 1808205529 in words is "one billion, eight hundred eight million, two hundred five thousand, five hundred twenty-nine".