8712561 has 32 divisors (see below), whose sum is σ = 14257152. Its totient is φ = 4656960.

The previous prime is 8712547. The next prime is 8712577. The reversal of 8712561 is 1652178.

It is not a de Polignac number, because 8712561 - 2⁶ = 8712497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8712661) 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 31 ways as a sum of consecutive naturals, for example, 9426 + ... + 10308.

It is an arithmetic number, because the mean of its divisors is an integer number (445536).

Almost surely, 2^8712561 is an apocalyptic number.

It is an amenable number.

8712561 is a deficient number, since it is larger than the sum of its proper divisors (5544591).

8712561 is a wasteful number, since it uses less digits than its factorization.

8712561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

The product of its digits is 3360, while the sum is 30.

The square root of 8712561 is about 2951.7047616589. The cubic root of 8712561 is about 205.7699461516.

The spelling of 8712561 in words is "eight million, seven hundred twelve thousand, five hundred sixty-one".