1561104 has 60 divisors (see below), whose sum is σ = 4502316. Its totient is φ = 504576.

The previous prime is 1561069. The next prime is 1561111. The reversal of 1561104 is 4011651.

1561104 is a `hidden beast` number, since 1 + 561 + 104 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 121104 = 1200^2 + 348^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5182 + ... + 5474.

2^1561104 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 1561104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2251158).

1561104 is an abundant number, since it is smaller than the sum of its proper divisors (2941212).

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

1561104 is a wasteful number, since it uses less digits than its factorization.

1561104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1561104 is about 1249.4414752200. The cubic root of 1561104 is about 116.0051523673.

Adding to 1561104 its reverse (4011651), we get a palindrome (5572755).

The spelling of 1561104 in words is "one million, five hundred sixty-one thousand, one hundred four".