3649561 has 4 divisors (see below), whose sum is σ = 3681972. Its totient is φ = 3617152.

The previous prime is 3649559. The next prime is 3649567. The reversal of 3649561 is 1659463.

3649561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1742400 + 1907161 = 1320^2 + 1381^2 .

It is a cyclic number.

It is not a de Polignac number, because 3649561 - 2¹ = 3649559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3649567) 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, 16036 + ... + 16261.

It is an arithmetic number, because the mean of its divisors is an integer number (920493).

Almost surely, 2^3649561 is an apocalyptic number.

It is an amenable number.

3649561 is a deficient number, since it is larger than the sum of its proper divisors (32411).

3649561 is a wasteful number, since it uses less digits than its factorization.

3649561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32410.

The product of its digits is 19440, while the sum is 34.

The square root of 3649561 is about 1910.3824224484. The cubic root of 3649561 is about 153.9619993943.

The spelling of 3649561 in words is "three million, six hundred forty-nine thousand, five hundred sixty-one".