561206 has 4 divisors (see below), whose sum is σ = 841812. Its totient is φ = 280602.

The previous prime is 561199. The next prime is 561229. The reversal of 561206 is 602165.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

561206 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 140300 + ... + 140303.

It is an arithmetic number, because the mean of its divisors is an integer number (210453).

2⁵⁶¹²⁰⁶ is an apocalyptic number.

561206 is a deficient number, since it is larger than the sum of its proper divisors (280606).

561206 is a wasteful number, since it uses less digits than its factorization.

561206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280605.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 561206 is about 749.1368366327. The cubic root of 561206 is about 82.4848334532.

It can be divided in two parts, 561 and 206, that added together give a palindrome (767).

The spelling of 561206 in words is "five hundred sixty-one thousand, two hundred six".