16993213 has 4 divisors (see below), whose sum is σ = 17388448. Its totient is φ = 16597980.

The previous prime is 16993199. The next prime is 16993237. The reversal of 16993213 is 31239961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16993213 - 2¹³ = 16985021 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 (16993243) 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, 197553 + ... + 197638.

It is an arithmetic number, because the mean of its divisors is an integer number (4347112).

Almost surely, 2^16993213 is an apocalyptic number.

It is an amenable number.

16993213 is a deficient number, since it is larger than the sum of its proper divisors (395235).

16993213 is an equidigital number, since it uses as much as digits as its factorization.

16993213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395234.

The product of its digits is 8748, while the sum is 34.

The square root of 16993213 is about 4122.2824988106. The cubic root of 16993213 is about 257.0939362990.

The spelling of 16993213 in words is "sixteen million, nine hundred ninety-three thousand, two hundred thirteen".