191447 has 2 divisors, whose sum is σ = 191448. Its totient is φ = 191446.
The previous prime is 191441. The next prime is 191449. The reversal of 191447 is 744191.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-191447 is a prime.
Together with 191449, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (191441) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95723 + 95724.
It is an arithmetic number, because the mean of its divisors is an integer number (95724).
2191447 is an apocalyptic number.
191447 is a deficient number, since it is larger than the sum of its proper divisors (1).
191447 is an equidigital number, since it uses as much as digits as its factorization.
191447 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 191447 is about 437.5465689501. The cubic root of 191447 is about 57.6345431625.
The spelling of 191447 in words is "one hundred ninety-one thousand, four hundred forty-seven".
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