15561104 has 40 divisors (see below), whose sum is σ = 32914560. Its totient is φ = 7083648.

The previous prime is 15561083. The next prime is 15561131. The reversal of 15561104 is 40116551.

15561104 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 15561104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15959 + ... + 16905.

It is an arithmetic number, because the mean of its divisors is an integer number (822864).

Almost surely, 2^15561104 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 15561104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16457280).

15561104 is an abundant number, since it is smaller than the sum of its proper divisors (17353456).

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

15561104 is a wasteful number, since it uses less digits than its factorization.

15561104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047 (or 1041 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 15561104 is about 3944.7565197360. The cubic root of 15561104 is about 249.6587557547.

Adding to 15561104 its reverse (40116551), we get a palindrome (55677655).

The spelling of 15561104 in words is "fifteen million, five hundred sixty-one thousand, one hundred four".