191671 has 2 divisors, whose sum is σ = 191672. Its totient is φ = 191670.

The previous prime is 191669. The next prime is 191677. The reversal of 191671 is 176191.

It is a weak prime.

It is an emirp because it is prime and its reverse (176191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191671 - 2¹ = 191669 is a prime.

Together with 191669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95835 + 95836.

It is an arithmetic number, because the mean of its divisors is an integer number (95836).

2¹⁹¹⁶⁷¹ is an apocalyptic number.

191671 is a deficient number, since it is larger than the sum of its proper divisors (1).

191671 is an equidigital number, since it uses as much as digits as its factorization.

191671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 25.

The square root of 191671 is about 437.8024668729. The cubic root of 191671 is about 57.6570125767.

The spelling of 191671 in words is "one hundred ninety-one thousand, six hundred seventy-one".