15561142 has 8 divisors (see below), whose sum is σ = 23363496. Its totient is φ = 7773312.

The previous prime is 15561131. The next prime is 15561157. The reversal of 15561142 is 24116551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363 + ... + 5590.

It is an arithmetic number, because the mean of its divisors is an integer number (2920437).

Almost surely, 2^15561142 is an apocalyptic number.

15561142 is a deficient number, since it is larger than the sum of its proper divisors (7802354).

15561142 is a wasteful number, since it uses less digits than its factorization.

15561142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7262.

The product of its digits is 1200, while the sum is 25.

The square root of 15561142 is about 3944.7613362534. The cubic root of 15561142 is about 249.6589589756.

Adding to 15561142 its reverse (24116551), we get a palindrome (39677693).

The spelling of 15561142 in words is "fifteen million, five hundred sixty-one thousand, one hundred forty-two".