2191006 has 4 divisors (see below), whose sum is σ = 3286512. Its totient is φ = 1095502.

The previous prime is 2191001. The next prime is 2191019. The reversal of 2191006 is 6001912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547750 + ... + 547753.

It is an arithmetic number, because the mean of its divisors is an integer number (821628).

2^2191006 is an apocalyptic number.

2191006 is a deficient number, since it is larger than the sum of its proper divisors (1095506).

2191006 is a wasteful number, since it uses less digits than its factorization.

2191006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095505.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 2191006 is about 1480.2047155715. The cubic root of 2191006 is about 129.8816674684.

Adding to 2191006 its reverse (6001912), we get a palindrome (8192918).

It can be divided in two parts, 219 and 1006, that added together give a triangular number (1225 = T₄₉).

The spelling of 2191006 in words is "two million, one hundred ninety-one thousand, six".