8009561 has 4 divisors (see below), whose sum is σ = 9153792. Its totient is φ = 6865332.

The previous prime is 8009557. The next prime is 8009569. The reversal of 8009561 is 1659008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8009561 - 2² = 8009557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8009569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 572105 + ... + 572118.

It is an arithmetic number, because the mean of its divisors is an integer number (2288448).

Almost surely, 2^8009561 is an apocalyptic number.

It is an amenable number.

8009561 is a deficient number, since it is larger than the sum of its proper divisors (1144231).

8009561 is a wasteful number, since it uses less digits than its factorization.

8009561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144230.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 8009561 is about 2830.1167820427. The cubic root of 8009561 is about 200.0796432805.

The spelling of 8009561 in words is "eight million, nine thousand, five hundred sixty-one".