16991273 has 8 divisors (see below), whose sum is σ = 19094208. Its totient is φ = 15002064.

The previous prime is 16991237. The next prime is 16991281. The reversal of 16991273 is 37219961.

It is a happy number.

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 16991273 - 2⁶ = 16991209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16991213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28115 + ... + 28712.

It is an arithmetic number, because the mean of its divisors is an integer number (2386776).

Almost surely, 2^16991273 is an apocalyptic number.

16991273 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16991273 is a deficient number, since it is larger than the sum of its proper divisors (2102935).

16991273 is a wasteful number, since it uses less digits than its factorization.

16991273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56863.

The product of its digits is 20412, while the sum is 38.

The square root of 16991273 is about 4122.0471855620. The cubic root of 16991273 is about 257.0841523691.

The spelling of 16991273 in words is "sixteen million, nine hundred ninety-one thousand, two hundred seventy-three".