16691273 has 4 divisors (see below), whose sum is σ = 16741140. Its totient is φ = 16641408.

The previous prime is 16691243. The next prime is 16691281. The reversal of 16691273 is 37219661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37219661 = 659 ⋅56479.

It can be written as a sum of positive squares in 2 ways, for example, as 2274064 + 14417209 = 1508^2 + 3797^2 .

It is a cyclic number.

It is not a de Polignac number, because 16691273 - 2¹⁶ = 16625737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16691243) 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 3 ways as a sum of consecutive naturals, for example, 24428 + ... + 25101.

It is an arithmetic number, because the mean of its divisors is an integer number (4185285).

Almost surely, 2^16691273 is an apocalyptic number.

It is an amenable number.

16691273 is a deficient number, since it is larger than the sum of its proper divisors (49867).

16691273 is an equidigital number, since it uses as much as digits as its factorization.

16691273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49866.

The product of its digits is 13608, while the sum is 35.

The square root of 16691273 is about 4085.4954411919. The cubic root of 16691273 is about 255.5621227536.

The spelling of 16691273 in words is "sixteen million, six hundred ninety-one thousand, two hundred seventy-three".