8178561 has 12 divisors (see below), whose sum is σ = 11980800. Its totient is φ = 5375160.

The previous prime is 8178559. The next prime is 8178563. The reversal of 8178561 is 1658718.

It is an interprime number because it is at equal distance from previous prime (8178559) and next prime (8178563).

It is not a de Polignac number, because 8178561 - 2¹ = 8178559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8178563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5761 + ... + 7038.

It is an arithmetic number, because the mean of its divisors is an integer number (998400).

Almost surely, 2^8178561 is an apocalyptic number.

It is an amenable number.

8178561 is a deficient number, since it is larger than the sum of its proper divisors (3802239).

8178561 is a wasteful number, since it uses less digits than its factorization.

8178561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12876 (or 12873 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 8178561 is about 2859.8183508748. The cubic root of 8178561 is about 201.4770727587.

The spelling of 8178561 in words is "eight million, one hundred seventy-eight thousand, five hundred sixty-one".