191649 has 8 divisors (see below), whose sum is σ = 257632. Its totient is φ = 126720.

The previous prime is 191627. The next prime is 191657. The reversal of 191649 is 946191.

191649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 191649 - 2⁹ = 191137 is a prime.

It is a Duffinian number.

191649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (191669) 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, 414 + ... + 744.

It is an arithmetic number, because the mean of its divisors is an integer number (32204).

2¹⁹¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

191649 is a deficient number, since it is larger than the sum of its proper divisors (65983).

191649 is a wasteful number, since it uses less digits than its factorization.

191649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527.

The product of its digits is 1944, while the sum is 30.

The square root of 191649 is about 437.7773406653. Note that the first 3 decimals coincide. The cubic root of 191649 is about 57.6548065348.

The spelling of 191649 in words is "one hundred ninety-one thousand, six hundred forty-nine".