4591561 has 12 divisors (see below), whose sum is σ = 5039820. Its totient is φ = 4180800.

The previous prime is 4591523. The next prime is 4591567. The reversal of 4591561 is 1651954.

It can be written as a sum of positive squares in 6 ways, for example, as 571536 + 4020025 = 756^2 + 2005^2 .

It is not a de Polignac number, because 4591561 - 2¹⁵ = 4558793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4591567) 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 11 ways as a sum of consecutive naturals, for example, 16935 + ... + 17203.

It is an arithmetic number, because the mean of its divisors is an integer number (419985).

Almost surely, 2^4591561 is an apocalyptic number.

It is an amenable number.

4591561 is a deficient number, since it is larger than the sum of its proper divisors (448259).

4591561 is a wasteful number, since it uses less digits than its factorization.

4591561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 383 counting only the distinct ones).

The product of its digits is 5400, while the sum is 31.

The square root of 4591561 is about 2142.7928037960. The cubic root of 4591561 is about 166.2085852330.

The spelling of 4591561 in words is "four million, five hundred ninety-one thousand, five hundred sixty-one".