564661 has 8 divisors (see below), whose sum is σ = 601920. Its totient is φ = 528192.

The previous prime is 564653. The next prime is 564667. The reversal of 564661 is 166465.

564661 = T₃₈ + T₃₉ + ... + T₁₅₀.

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 564661 - 2³ = 564653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564667) 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, 2016 + ... + 2278.

It is an arithmetic number, because the mean of its divisors is an integer number (75240).

2⁵⁶⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

564661 is a deficient number, since it is larger than the sum of its proper divisors (37259).

564661 is a wasteful number, since it uses less digits than its factorization.

564661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its digits is 4320, while the sum is 28.

The square root of 564661 is about 751.4392856379. The cubic root of 564661 is about 82.6537567278.

It can be divided in two parts, 564 and 661, that added together give a triangular number (1225 = T₄₉).

The spelling of 564661 in words is "five hundred sixty-four thousand, six hundred sixty-one".