191641 has 4 divisors (see below), whose sum is σ = 202932. Its totient is φ = 180352.

The previous prime is 191627. The next prime is 191657. The reversal of 191641 is 146191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99225 + 92416 = 315^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 191641 - 2¹¹ = 189593 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5620 + ... + 5653.

It is an arithmetic number, because the mean of its divisors is an integer number (50733).

2¹⁹¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

191641 is a deficient number, since it is larger than the sum of its proper divisors (11291).

191641 is a wasteful number, since it uses less digits than its factorization.

191641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11290.

The product of its digits is 216, while the sum is 22.

The square root of 191641 is about 437.7682035050. The cubic root of 191641 is about 57.6540042958.

The spelling of 191641 in words is "one hundred ninety-one thousand, six hundred forty-one".