191643 has 8 divisors (see below), whose sum is σ = 258048. Its totient is φ = 126504.

The previous prime is 191627. The next prime is 191657. The reversal of 191643 is 346191.

191643 is nontrivially palindromic in base 15.

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

It is not a de Polignac number, because 191643 - 2⁴ = 191627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191693) 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, 130 + ... + 632.

It is an arithmetic number, because the mean of its divisors is an integer number (32256).

2¹⁹¹⁶⁴³ is an apocalyptic number.

191643 is a deficient number, since it is larger than the sum of its proper divisors (66405).

191643 is a wasteful number, since it uses less digits than its factorization.

191643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633.

The product of its digits is 648, while the sum is 24.

The square root of 191643 is about 437.7704878130. The cubic root of 191643 is about 57.6542048576.

Adding to 191643 its product of digits (648), we get a palindrome (192291).

The spelling of 191643 in words is "one hundred ninety-one thousand, six hundred forty-three".