8561409 has 8 divisors (see below), whose sum is σ = 11808960. Its totient is φ = 5510736.

The previous prime is 8561407. The next prime is 8561417. The reversal of 8561409 is 9041658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8561409 - 2¹ = 8561407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8561409.

It is not an unprimeable number, because it can be changed into a prime (8561407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49117 + ... + 49290.

It is an arithmetic number, because the mean of its divisors is an integer number (1476120).

Almost surely, 2^8561409 is an apocalyptic number.

It is an amenable number.

8561409 is a deficient number, since it is larger than the sum of its proper divisors (3247551).

8561409 is a wasteful number, since it uses less digits than its factorization.

8561409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98439.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 8561409 is about 2925.9885509004. The cubic root of 8561409 is about 204.5730475548.

Subtracting 8561409 from its reverse (9041658), we obtain a square (480249 = 693²).

The spelling of 8561409 in words is "eight million, five hundred sixty-one thousand, four hundred nine".