16506913 has 4 divisors (see below), whose sum is σ = 16525188. Its totient is φ = 16488640.

The previous prime is 16506907. The next prime is 16506923. The reversal of 16506913 is 31960561.

16506913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 5702544 + 10804369 = 2388^2 + 3287^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506913 - 2⁹ = 16506401 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16506923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7708 + ... + 9613.

It is an arithmetic number, because the mean of its divisors is an integer number (4131297).

Almost surely, 2^16506913 is an apocalyptic number.

It is an amenable number.

16506913 is a deficient number, since it is larger than the sum of its proper divisors (18275).

16506913 is an equidigital number, since it uses as much as digits as its factorization.

16506913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18274.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 16506913 is about 4062.8700446852. The cubic root of 16506913 is about 254.6177175901.

The spelling of 16506913 in words is "sixteen million, five hundred six thousand, nine hundred thirteen".