2191247 has 2 divisors, whose sum is σ = 2191248. Its totient is φ = 2191246.

The previous prime is 2191243. The next prime is 2191261. The reversal of 2191247 is 7421912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2191247 - 2² = 2191243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191243) 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 as a sum of consecutive naturals, namely, 1095623 + 1095624.

It is an arithmetic number, because the mean of its divisors is an integer number (1095624).

2^2191247 is an apocalyptic number.

2191247 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191247 is an equidigital number, since it uses as much as digits as its factorization.

2191247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 2191247 is about 1480.2861209915. The cubic root of 2191247 is about 129.8864294110.

The spelling of 2191247 in words is "two million, one hundred ninety-one thousand, two hundred forty-seven".