16520881 has 8 divisors (see below), whose sum is σ = 17825024. Its totient is φ = 15221520.

The previous prime is 16520879. The next prime is 16520893. The reversal of 16520881 is 18802561.

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 16520881 - 2¹ = 16520879 is a prime.

It is a super-2 number, since 2×16520881² = 545879018032322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16520851) 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 7 ways as a sum of consecutive naturals, for example, 9760 + ... + 11326.

It is an arithmetic number, because the mean of its divisors is an integer number (2228128).

Almost surely, 2^16520881 is an apocalyptic number.

It is an amenable number.

16520881 is a deficient number, since it is larger than the sum of its proper divisors (1304143).

16520881 is a wasteful number, since it uses less digits than its factorization.

16520881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 16520881 is about 4064.5886630753. The cubic root of 16520881 is about 254.6895157430.

The spelling of 16520881 in words is "sixteen million, five hundred twenty thousand, eight hundred eighty-one".