16520965 has 8 divisors (see below), whose sum is σ = 19847160. Its totient is φ = 13202112.

The previous prime is 16520951. The next prime is 16521023. The reversal of 16520965 is 56902561.

It is a happy number.

16520965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12996 + 16507969 = 114^2 + 4063^2 .

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 16520965 - 2⁷ = 16520837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16520965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6951 + ... + 9019.

It is an arithmetic number, because the mean of its divisors is an integer number (2480895).

Almost surely, 2^16520965 is an apocalyptic number.

It is an amenable number.

16520965 is a deficient number, since it is larger than the sum of its proper divisors (3326195).

16520965 is a wasteful number, since it uses less digits than its factorization.

16520965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 16520965 is about 4064.5989962111. The cubic root of 16520965 is about 254.6899473964.

The spelling of 16520965 in words is "sixteen million, five hundred twenty thousand, nine hundred sixty-five".