2016521 has 8 divisors (see below), whose sum is σ = 2186184. Its totient is φ = 1848960.

The previous prime is 2016517. The next prime is 2016529. The reversal of 2016521 is 1256102.

It can be written as a sum of positive squares in 4 ways, for example, as 25600 + 1990921 = 160^2 + 1411^2 .

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 2016521 - 2² = 2016517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2016521.

It is not an unprimeable number, because it can be changed into a prime (2016529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1925 + ... + 2781.

It is an arithmetic number, because the mean of its divisors is an integer number (273273).

2^2016521 is an apocalyptic number.

It is an amenable number.

2016521 is a deficient number, since it is larger than the sum of its proper divisors (169663).

2016521 is a wasteful number, since it uses less digits than its factorization.

2016521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2016521 is about 1420.0426049947. The cubic root of 2016521 is about 126.3380733682.

The spelling of 2016521 in words is "two million, sixteen thousand, five hundred twenty-one".