561996 has 36 divisors (see below), whose sum is σ = 1447992. Its totient is φ = 183744.

The previous prime is 561983. The next prime is 561997. The reversal of 561996 is 699165.

561996 is a `hidden beast` number, since 561 + 9 + 96 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 561996.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561996.

It is not an unprimeable number, because it can be changed into a prime (561997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2296 + ... + 2528.

It is an arithmetic number, because the mean of its divisors is an integer number (40222).

2⁵⁶¹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723996).

561996 is an abundant number, since it is smaller than the sum of its proper divisors (885996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561996 is a wasteful number, since it uses less digits than its factorization.

561996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 305 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 561996 is about 749.6639247023. The cubic root of 561996 is about 82.5235194651.

It can be divided in two parts, 5 and 61996, that added together give a square (62001 = 249²).

The spelling of 561996 in words is "five hundred sixty-one thousand, nine hundred ninety-six".