191947 has 8 divisors (see below), whose sum is σ = 232416. Its totient is φ = 154752.

The previous prime is 191929. The next prime is 191953. The reversal of 191947 is 749191.

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

It is a cyclic number.

It is not a de Polignac number, because 191947 - 2¹⁵ = 159179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (29052).

2¹⁹¹⁹⁴⁷ is an apocalyptic number.

191947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

191947 is a deficient number, since it is larger than the sum of its proper divisors (40469).

191947 is a wasteful number, since it uses less digits than its factorization.

191947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637.

The product of its digits is 2268, while the sum is 31.

The square root of 191947 is about 438.1175641309. The cubic root of 191947 is about 57.6846740441.

The spelling of 191947 in words is "one hundred ninety-one thousand, nine hundred forty-seven".