3633561 has 6 divisors (see below), whose sum is σ = 5248490. Its totient is φ = 2422368.

The previous prime is 3633559. The next prime is 3633569. The reversal of 3633561 is 1653363.

It can be written as a sum of positive squares in only one way, i.e., 3080025 + 553536 = 1755^2 + 744^2 .

It is not a de Polignac number, because 3633561 - 2¹ = 3633559 is a prime.

It is a d-powerful number, because it can be written as 3 + 6 + 3⁴ + 3⁶ + 5⁹ + 6⁸ + 1 .

It is a Duffinian number.

It is a Curzon number.

3633561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3633569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 201856 + ... + 201873.

Almost surely, 2^3633561 is an apocalyptic number.

It is an amenable number.

3633561 is a deficient number, since it is larger than the sum of its proper divisors (1614929).

3633561 is a wasteful number, since it uses less digits than its factorization.

3633561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403735 (or 403732 counting only the distinct ones).

The product of its digits is 4860, while the sum is 27.

The square root of 3633561 is about 1906.1901793892. The cubic root of 3633561 is about 153.7366754267.

The spelling of 3633561 in words is "three million, six hundred thirty-three thousand, five hundred sixty-one".