8457561 has 32 divisors (see below), whose sum is σ = 14539520. Its totient is φ = 4758912.

The previous prime is 8457539. The next prime is 8457563. The reversal of 8457561 is 1657548.

8457561 is a `hidden beast` number, since 84 + 575 + 6 + 1 = 666.

It is not a de Polignac number, because 8457561 - 2⁵ = 8457529 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

8457561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8457563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13491 + ... + 14103.

It is an arithmetic number, because the mean of its divisors is an integer number (454360).

Almost surely, 2^8457561 is an apocalyptic number.

It is an amenable number.

8457561 is a deficient number, since it is larger than the sum of its proper divisors (6081959).

8457561 is a wasteful number, since it uses less digits than its factorization.

8457561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702 (or 696 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 8457561 is about 2908.1886114900. The cubic root of 8457561 is about 203.7425385251.

The spelling of 8457561 in words is "eight million, four hundred fifty-seven thousand, five hundred sixty-one".