16691213 has 24 divisors (see below), whose sum is σ = 21422880. Its totient is φ = 12858720.

The previous prime is 16691197. The next prime is 16691221. The reversal of 16691213 is 31219661.

It is not a de Polignac number, because 16691213 - 2⁴ = 16691197 is a prime.

It is a super-2 number, since 2×16691213² = 557193182822738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 93158 + ... + 93336.

It is an arithmetic number, because the mean of its divisors is an integer number (892620).

Almost surely, 2^16691213 is an apocalyptic number.

It is an amenable number.

16691213 is a deficient number, since it is larger than the sum of its proper divisors (4731667).

16691213 is a wasteful number, since it uses less digits than its factorization.

16691213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 370 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 16691213 is about 4085.4880981347. The cubic root of 16691213 is about 255.5618165308.

It can be divided in two parts, 1669 and 1213, that added together give a palindrome (2882).

The spelling of 16691213 in words is "sixteen million, six hundred ninety-one thousand, two hundred thirteen".