16849813 has 4 divisors (see below), whose sum is σ = 17167788. Its totient is φ = 16531840.

The previous prime is 16849793. The next prime is 16849843. The reversal of 16849813 is 31894861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31894861 = 97 ⋅328813.

It can be written as a sum of positive squares in 2 ways, for example, as 11573604 + 5276209 = 3402^2 + 2297^2 .

It is a cyclic number.

It is not a de Polignac number, because 16849813 - 2¹³ = 16841621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16849843) 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, 158908 + ... + 159013.

It is an arithmetic number, because the mean of its divisors is an integer number (4291947).

Almost surely, 2^16849813 is an apocalyptic number.

It is an amenable number.

16849813 is a deficient number, since it is larger than the sum of its proper divisors (317975).

16849813 is an equidigital number, since it uses as much as digits as its factorization.

16849813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317974.

The product of its digits is 41472, while the sum is 40.

The square root of 16849813 is about 4104.8523724977. The cubic root of 16849813 is about 256.3687161207.

The spelling of 16849813 in words is "sixteen million, eight hundred forty-nine thousand, eight hundred thirteen".