16008521 has 4 divisors (see below), whose sum is σ = 16024212. Its totient is φ = 15992832.

The previous prime is 16008497. The next prime is 16008523. The reversal of 16008521 is 12580061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2758921 + 13249600 = 1661^2 + 3640^2 .

It is a cyclic number.

It is not a de Polignac number, because 16008521 - 2²² = 11814217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16008523) 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 3 ways as a sum of consecutive naturals, for example, 6200 + ... + 8393.

It is an arithmetic number, because the mean of its divisors is an integer number (4006053).

Almost surely, 2^16008521 is an apocalyptic number.

It is an amenable number.

16008521 is a deficient number, since it is larger than the sum of its proper divisors (15691).

16008521 is a wasteful number, since it uses less digits than its factorization.

16008521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15690.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 16008521 is about 4001.0649832263. The cubic root of 16008521 is about 252.0289344873.

Adding to 16008521 its reverse (12580061), we get a palindrome (28588582).

The spelling of 16008521 in words is "sixteen million, eight thousand, five hundred twenty-one".