15561441 has 12 divisors (see below), whose sum is σ = 25688832. Its totient is φ = 8892216.

The previous prime is 15561439. The next prime is 15561449. The reversal of 15561441 is 14416551.

15561441 is a `hidden beast` number, since 1 + 5 + 5 + 614 + 41 = 666.

It is not a de Polignac number, because 15561441 - 2¹ = 15561439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15561449) 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, 123441 + ... + 123566.

It is an arithmetic number, because the mean of its divisors is an integer number (2140736).

Almost surely, 2^15561441 is an apocalyptic number.

It is an amenable number.

15561441 is a deficient number, since it is larger than the sum of its proper divisors (10127391).

15561441 is a wasteful number, since it uses less digits than its factorization.

15561441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247020 (or 247017 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 15561441 is about 3944.7992344351. The cubic root of 15561441 is about 249.6605579917.

Adding to 15561441 its reverse (14416551), we get a palindrome (29977992).

The spelling of 15561441 in words is "fifteen million, five hundred sixty-one thousand, four hundred forty-one".