191601 has 12 divisors (see below), whose sum is σ = 282100. Its totient is φ = 125280.

The previous prime is 191599. The next prime is 191621. The reversal of 191601 is 106191.

It can be written as a sum of positive squares in 2 ways, for example, as 62001 + 129600 = 249^2 + 360^2 .

It is not a de Polignac number, because 191601 - 2¹ = 191599 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 375 + ... + 723.

2¹⁹¹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

191601 is a deficient number, since it is larger than the sum of its proper divisors (90499).

191601 is a wasteful number, since it uses less digits than its factorization.

191601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 191601 is about 437.7225148425. The cubic root of 191601 is about 57.6499927662.

Adding to 191601 its reverse (106191), we get a palindrome (297792).

The spelling of 191601 in words is "one hundred ninety-one thousand, six hundred one".