2191207 has 4 divisors (see below), whose sum is σ = 2204496. Its totient is φ = 2177920.

The previous prime is 2191199. The next prime is 2191229. The reversal of 2191207 is 7021912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2191207 - 2³ = 2191199 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191247) 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, 6394 + ... + 6727.

It is an arithmetic number, because the mean of its divisors is an integer number (551124).

2^2191207 is an apocalyptic number.

2191207 is a deficient number, since it is larger than the sum of its proper divisors (13289).

2191207 is a wasteful number, since it uses less digits than its factorization.

2191207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13288.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 2191207 is about 1480.2726100283. The cubic root of 2191207 is about 129.8856390712.

The spelling of 2191207 in words is "two million, one hundred ninety-one thousand, two hundred seven".