16015561 has 8 divisors (see below), whose sum is σ = 16980224. Its totient is φ = 15078960.

The previous prime is 16015553. The next prime is 16015577. The reversal of 16015561 is 16551061.

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

It is a cyclic number.

It is not a de Polignac number, because 16015561 - 2³ = 16015553 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (16015361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5835 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (2122528).

Almost surely, 2^16015561 is an apocalyptic number.

It is an amenable number.

16015561 is a deficient number, since it is larger than the sum of its proper divisors (964663).

16015561 is a wasteful number, since it uses less digits than its factorization.

16015561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14031.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 16015561 is about 4001.9446522909. The cubic root of 16015561 is about 252.0658736414.

The spelling of 16015561 in words is "sixteen million, fifteen thousand, five hundred sixty-one".