8541561897 has 24 divisors (see below), whose sum is σ = 13499422560. Its totient is φ = 5161322880.

The previous prime is 8541561863. The next prime is 8541561907. The reversal of 8541561897 is 7981651458.

It is a happy number.

8541561897 is a `hidden beast` number, since 8 + 5 + 4 + 15 + 618 + 9 + 7 = 666.

It is not a de Polignac number, because 8541561897 - 2²⁶ = 8474453033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8541561797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94647 + ... + 161372.

It is an arithmetic number, because the mean of its divisors is an integer number (562475940).

Almost surely, 2^8541561897 is an apocalyptic number.

It is an amenable number.

8541561897 is a deficient number, since it is larger than the sum of its proper divisors (4957860663).

8541561897 is a wasteful number, since it uses less digits than its factorization.

8541561897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256373 (or 256370 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The square root of 8541561897 is about 92420.5707459113. The cubic root of 8541561897 is about 2044.1484447403.

It can be divided in two parts, 8541561 and 897, that added together give a palindrome (8542458).

The spelling of 8541561897 in words is "eight billion, five hundred forty-one million, five hundred sixty-one thousand, eight hundred ninety-seven".