16999505 has 4 divisors (see below), whose sum is σ = 20399412. Its totient is φ = 13599600.

The previous prime is 16999487. The next prime is 16999519. The reversal of 16999505 is 50599961.

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 4068289 + 12931216 = 2017^2 + 3596^2 .

It is not a de Polignac number, because 16999505 - 2¹⁰ = 16998481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699946 + ... + 1699955.

It is an arithmetic number, because the mean of its divisors is an integer number (5099853).

Almost surely, 2^16999505 is an apocalyptic number.

It is an amenable number.

16999505 is a deficient number, since it is larger than the sum of its proper divisors (3399907).

16999505 is an equidigital number, since it uses as much as digits as its factorization.

16999505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399906.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 16999505 is about 4123.0455976135. The cubic root of 16999505 is about 257.1256633859.

The spelling of 16999505 in words is "sixteen million, nine hundred ninety-nine thousand, five hundred five".