561836 has 18 divisors (see below), whose sum is σ = 1082172. Its totient is φ = 253120.

The previous prime is 561829. The next prime is 561839. The reversal of 561836 is 638165.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 561799 and 561808.

It is not an unprimeable number, because it can be changed into a prime (561839) by changing a digit.

561836 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4916 + ... + 5028.

2⁵⁶¹⁸³⁶ is an apocalyptic number.

It is an amenable number.

561836 is a deficient number, since it is larger than the sum of its proper divisors (520336).

561836 is a wasteful number, since it uses less digits than its factorization.

561836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 126 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 561836 is about 749.5572026203. The cubic root of 561836 is about 82.5156872526.

It can be divided in two parts, 561 and 836, that multiplied together give a triangular number (468996 = T₉₆₈).

The spelling of 561836 in words is "five hundred sixty-one thousand, eight hundred thirty-six".