2009191 has 2 divisors, whose sum is σ = 2009192.
Its totient is φ = 2009190.
The previous prime is 2009173. The next prime is 2009209. The reversal of 2009191 is 1919002.
It can be divided in two parts, 20091 and 91, that multiplied together give a palindrome (1828281).
It is a balanced prime because it is at equal distance from previous prime (2009173) and next prime (2009209).
It is a cyclic number.
It is not a de Polignac number, because 2009191 - 29 = 2008679 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2009171) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004595 + 1004596.
It is an arithmetic number, because the mean of its divisors is an integer number (1004596).
22009191 is an apocalyptic number.
2009191 is a deficient number, since it is larger than the sum of its proper divisors (1).
2009191 is an equidigital number, since it uses as much as digits as its factorization.
2009191 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 162, while the sum is 22.
The square root of 2009191 is about 1417.4593468597.
The cubic root of 2009191 is about 126.1848090060.
The spelling of 2009191 in words is "two million, nine thousand, one hundred ninety-one".