16520145 has 16 divisors (see below), whose sum is σ = 26628480. Its totient is φ = 8745344.

The previous prime is 16520143. The next prime is 16520159. The reversal of 16520145 is 54102561.

It is a cyclic number.

It is not a de Polignac number, because 16520145 - 2¹ = 16520143 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16520143) 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 15 ways as a sum of consecutive naturals, for example, 1965 + ... + 6074.

It is an arithmetic number, because the mean of its divisors is an integer number (1664280).

Almost surely, 2^16520145 is an apocalyptic number.

16520145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16520145 is a deficient number, since it is larger than the sum of its proper divisors (10108335).

16520145 is a wasteful number, since it uses less digits than its factorization.

16520145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8184.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 16520145 is about 4064.4981240001. The cubic root of 16520145 is about 254.6857335745.

The spelling of 16520145 in words is "sixteen million, five hundred twenty thousand, one hundred forty-five".