16994891 has 4 divisors (see below), whose sum is σ = 17283000. Its totient is φ = 16706784.

The previous prime is 16994881. The next prime is 16994893. The reversal of 16994891 is 19849961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19849961 = 43 ⋅461627.

It is a cyclic number.

It is not a de Polignac number, because 16994891 - 2⁶ = 16994827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16994893) 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, 143966 + ... + 144083.

It is an arithmetic number, because the mean of its divisors is an integer number (4320750).

Almost surely, 2^16994891 is an apocalyptic number.

16994891 is a deficient number, since it is larger than the sum of its proper divisors (288109).

16994891 is an equidigital number, since it uses as much as digits as its factorization.

16994891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288108.

The product of its digits is 139968, while the sum is 47.

The square root of 16994891 is about 4122.4860218077. The cubic root of 16994891 is about 257.1023982936.

The spelling of 16994891 in words is "sixteen million, nine hundred ninety-four thousand, eight hundred ninety-one".