Subtracting from 1561560 its reverse (651651), we obtain a palindrome (909909).
It is a self number, because there is not a number n which added to its sum of digits gives 1561560.
It is a congruent number.
It is an unprimeable number.
21561560 is an apocalyptic number.
1561560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1561560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3162240).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1561560 is a wasteful number, since it uses less digits than its factorization.
1561560 is an odious number, because the sum of its binary digits is odd.
The square root of 1561560 is about 1249.6239434326. The cubic root of 1561560 is about 116.0164463404.
The spelling of 1561560 in words is "one million, five hundred sixty-one thousand, five hundred sixty".