8561641 has 8 divisors (see below), whose sum is σ = 9662400. Its totient is φ = 7514640.

The previous prime is 8561633. The next prime is 8561701. The reversal of 8561641 is 1461658.

8561641 = T₄₇₆ + T₄₇₇ + ... + T₅₄₁.

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

It is a cyclic number.

It is not a de Polignac number, because 8561641 - 2³ = 8561633 is a prime.

It is a super-2 number, since 2×8561641² = 146603393225762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8561041) 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 7 ways as a sum of consecutive naturals, for example, 13101 + ... + 13738.

It is an arithmetic number, because the mean of its divisors is an integer number (1207800).

Almost surely, 2^8561641 is an apocalyptic number.

It is an amenable number.

8561641 is a deficient number, since it is larger than the sum of its proper divisors (1100759).

8561641 is a wasteful number, since it uses less digits than its factorization.

8561641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26879.

The product of its digits is 5760, while the sum is 31.

The square root of 8561641 is about 2926.0281953529. The cubic root of 8561641 is about 204.5748954016.

The spelling of 8561641 in words is "eight million, five hundred sixty-one thousand, six hundred forty-one".