4517561 has 4 divisors (see below), whose sum is σ = 4602852. Its totient is φ = 4432272.

The previous prime is 4517543. The next prime is 4517587. The reversal of 4517561 is 1657154.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1657154 = 2 ⋅828577.

It can be written as a sum of positive squares in 2 ways, for example, as 3171961 + 1345600 = 1781^2 + 1160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4517561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4517521) 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 3 ways as a sum of consecutive naturals, for example, 42566 + ... + 42671.

It is an arithmetic number, because the mean of its divisors is an integer number (1150713).

Almost surely, 2^4517561 is an apocalyptic number.

It is an amenable number.

4517561 is a deficient number, since it is larger than the sum of its proper divisors (85291).

4517561 is an equidigital number, since it uses as much as digits as its factorization.

4517561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85290.

The product of its digits is 4200, while the sum is 29.

The square root of 4517561 is about 2125.4554805970. The cubic root of 4517561 is about 165.3108434802.

The spelling of 4517561 in words is "four million, five hundred seventeen thousand, five hundred sixty-one".