15561042 has 32 divisors (see below), whose sum is σ = 36329472. Its totient is φ = 4350864.

The previous prime is 15561037. The next prime is 15561043. The reversal of 15561042 is 24016551.

15561042 is nontrivially palindromic in base 13.

It is not an unprimeable number, because it can be changed into a prime (15561043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1968 + ... + 5915.

It is an arithmetic number, because the mean of its divisors is an integer number (1135296).

Almost surely, 2^15561042 is an apocalyptic number.

15561042 is an abundant number, since it is smaller than the sum of its proper divisors (20768430).

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

15561042 is a wasteful number, since it uses less digits than its factorization.

15561042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7942.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 15561042 is about 3944.7486611950. The cubic root of 15561042 is about 249.6584241831.

Adding to 15561042 its reverse (24016551), we get a palindrome (39577593).

The spelling of 15561042 in words is "fifteen million, five hundred sixty-one thousand, forty-two".