2191208 has 8 divisors (see below), whose sum is σ = 4108530.
Its totient is φ = 1095600.
The previous prime is 2191199. The next prime is 2191229. The reversal of 2191208 is 8021912.
2191208 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in only one way, i.e., 2184484 + 6724 = 1478^2 + 82^2
It is a tau number, because it is divible by the number of its divisors (8).
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136943 + ... + 136958.
22191208 is an apocalyptic number.
It is an amenable number.
2191208 is a deficient number, since it is larger than the sum of its proper divisors (1917322).
2191208 is a wasteful number, since it uses less digits than its factorization.
2191208 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 273907 (or 273903 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 23.
The square root of 2191208 is about 1480.2729478039.
The cubic root of 2191208 is about 129.8856588298.
The spelling of 2191208 in words is "two million, one hundred ninety-one thousand, two hundred eight".