191285 has 8 divisors (see below), whose sum is σ = 233376. Its totient is φ = 150480.

The previous prime is 191281. The next prime is 191297. The reversal of 191285 is 582191.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 191285 - 2² = 191281 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191281) by changing a digit.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50 + ... + 620.

It is an arithmetic number, because the mean of its divisors is an integer number (29172).

2¹⁹¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

191285 is a deficient number, since it is larger than the sum of its proper divisors (42091).

191285 is an equidigital number, since it uses as much as digits as its factorization.

191285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643.

The product of its digits is 720, while the sum is 26.

The square root of 191285 is about 437.3614066193. The cubic root of 191285 is about 57.6182820375.

The spelling of 191285 in words is "one hundred ninety-one thousand, two hundred eighty-five".