8723561 has 16 divisors (see below), whose sum is σ = 10942080. Its totient is φ = 6756480.

The previous prime is 8723551. The next prime is 8723569. The reversal of 8723561 is 1653278.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8723561 - 2⁶ = 8723497 is a prime.

It is a super-2 number, since 2×8723561² = 152201033041442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8723569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21125 + ... + 21533.

It is an arithmetic number, because the mean of its divisors is an integer number (683880).

Almost surely, 2^8723561 is an apocalyptic number.

It is an amenable number.

8723561 is a deficient number, since it is larger than the sum of its proper divisors (2218519).

8723561 is a wasteful number, since it uses less digits than its factorization.

8723561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704.

The product of its digits is 10080, while the sum is 32.

The square root of 8723561 is about 2953.5675038841. The cubic root of 8723561 is about 205.8565076688.

The spelling of 8723561 in words is "eight million, seven hundred twenty-three thousand, five hundred sixty-one".