561709 has 4 divisors (see below), whose sum is σ = 574816. Its totient is φ = 548604.

The previous prime is 561703. The next prime is 561713. The reversal of 561709 is 907165.

It is a happy number.

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 561709 - 2¹³ = 553517 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 (561703) 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, 6489 + ... + 6574.

It is an arithmetic number, because the mean of its divisors is an integer number (143704).

2⁵⁶¹⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

561709 is a deficient number, since it is larger than the sum of its proper divisors (13107).

561709 is a wasteful number, since it uses less digits than its factorization.

561709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13106.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 561709 is about 749.4724811492. The cubic root of 561709 is about 82.5094693753.

The spelling of 561709 in words is "five hundred sixty-one thousand, seven hundred nine".