8541561 has 16 divisors (see below), whose sum is σ = 13368704. Its totient is φ = 4748544.

The previous prime is 8541553. The next prime is 8541587. The reversal of 8541561 is 1651458.

It is not a de Polignac number, because 8541561 - 2³ = 8541553 is a prime.

It is a Duffinian number.

8541561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8541521) 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 15 ways as a sum of consecutive naturals, for example, 4720 + ... + 6273.

It is an arithmetic number, because the mean of its divisors is an integer number (835544).

Almost surely, 2^8541561 is an apocalyptic number.

It is an amenable number.

8541561 is a deficient number, since it is larger than the sum of its proper divisors (4827143).

8541561 is a wasteful number, since it uses less digits than its factorization.

8541561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11040.

The product of its digits is 4800, while the sum is 30.

The square root of 8541561 is about 2922.5949086386. The cubic root of 8541561 is about 204.4148373184.

It can be divided in two parts, 854 and 1561, that added together give a triangular number (2415 = T₆₉).

The spelling of 8541561 in words is "eight million, five hundred forty-one thousand, five hundred sixty-one".