561679 has 4 divisors (see below), whose sum is σ = 568080. Its totient is φ = 555280.

The previous prime is 561667. The next prime is 561703. The reversal of 561679 is 976165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561679 - 2⁷ = 561551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561079) 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, 3067 + ... + 3244.

It is an arithmetic number, because the mean of its divisors is an integer number (142020).

2⁵⁶¹⁶⁷⁹ is an apocalyptic number.

561679 is a deficient number, since it is larger than the sum of its proper divisors (6401).

561679 is an equidigital number, since it uses as much as digits as its factorization.

561679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6400.

The product of its digits is 11340, while the sum is 34.

The square root of 561679 is about 749.4524668049. The cubic root of 561679 is about 82.5080004485.

The spelling of 561679 in words is "five hundred sixty-one thousand, six hundred seventy-nine".