8871561 has 6 divisors (see below), whose sum is σ = 12814490. Its totient is φ = 5914368.

The previous prime is 8871553. The next prime is 8871571. The reversal of 8871561 is 1651788.

8871561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8088336 + 783225 = 2844^2 + 885^2 .

It is not a de Polignac number, because 8871561 - 2³ = 8871553 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8871571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 492856 + ... + 492873.

Almost surely, 2^8871561 is an apocalyptic number.

It is an amenable number.

8871561 is a deficient number, since it is larger than the sum of its proper divisors (3942929).

8871561 is a wasteful number, since it uses less digits than its factorization.

8871561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985735 (or 985732 counting only the distinct ones).

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

The square root of 8871561 is about 2978.5165770900. The cubic root of 8871561 is about 207.0141417210.

The spelling of 8871561 in words is "eight million, eight hundred seventy-one thousand, five hundred sixty-one".