191441 has 2 divisors, whose sum is σ = 191442. Its totient is φ = 191440.

The previous prime is 191413. The next prime is 191447. The reversal of 191441 is 144191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180625 + 10816 = 425^2 + 104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191441 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 191441.

It is not a weakly prime, because it can be changed into another prime (191447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95720 + 95721.

It is an arithmetic number, because the mean of its divisors is an integer number (95721).

2¹⁹¹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

191441 is a deficient number, since it is larger than the sum of its proper divisors (1).

191441 is an equidigital number, since it uses as much as digits as its factorization.

191441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 191441 is about 437.5397124833. The cubic root of 191441 is about 57.6339410622.

The spelling of 191441 in words is "one hundred ninety-one thousand, four hundred forty-one".