8171561 has 12 divisors (see below), whose sum is σ = 8644608. Its totient is φ = 7720272.

The previous prime is 8171549. The next prime is 8171563. The reversal of 8171561 is 1651718.

8171561 = 9² + 10² + ... + 290².

It is not a de Polignac number, because 8171561 - 2⁶ = 8171497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8171563) 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, 64280 + ... + 64406.

It is an arithmetic number, because the mean of its divisors is an integer number (720384).

Almost surely, 2^8171561 is an apocalyptic number.

It is an amenable number.

8171561 is a deficient number, since it is larger than the sum of its proper divisors (473047).

8171561 is a wasteful number, since it uses less digits than its factorization.

8171561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 211 counting only the distinct ones).

The product of its digits is 1680, while the sum is 29.

The square root of 8171561 is about 2858.5942349344. The cubic root of 8171561 is about 201.4195751920.

The spelling of 8171561 in words is "eight million, one hundred seventy-one thousand, five hundred sixty-one".