4509561 has 8 divisors (see below), whose sum is σ = 6871744. Its totient is φ = 2576880.

The previous prime is 4509559. The next prime is 4509599. The reversal of 4509561 is 1659054.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4509561 - 2¹ = 4509559 is a prime.

It is a super-2 number, since 2×4509561² = 40672280825442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4509551) 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 7 ways as a sum of consecutive naturals, for example, 107350 + ... + 107391.

It is an arithmetic number, because the mean of its divisors is an integer number (858968).

Almost surely, 2^4509561 is an apocalyptic number.

It is an amenable number.

4509561 is a deficient number, since it is larger than the sum of its proper divisors (2362183).

4509561 is a wasteful number, since it uses less digits than its factorization.

4509561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214751.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 4509561 is about 2123.5726971309. The cubic root of 4509561 is about 165.2132046462.

It can be divided in two parts, 450 and 9561, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 4509561 in words is "four million, five hundred nine thousand, five hundred sixty-one".