191501 has 4 divisors (see below), whose sum is σ = 201600. Its totient is φ = 181404.

The previous prime is 191497. The next prime is 191507. The reversal of 191501 is 105191.

It is a happy number.

191501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 105191 = 37 ⋅2843.

It is a cyclic number.

It is not a de Polignac number, because 191501 - 2² = 191497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191507) 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, 5021 + ... + 5058.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

2¹⁹¹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

191501 is a deficient number, since it is larger than the sum of its proper divisors (10099).

191501 is a wasteful number, since it uses less digits than its factorization.

191501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10098.

The product of its (nonzero) digits is 45, while the sum is 17.

The square root of 191501 is about 437.6082723167. The cubic root of 191501 is about 57.6399614989.

Adding to 191501 its reverse (105191), we get a palindrome (296692).

The spelling of 191501 in words is "one hundred ninety-one thousand, five hundred one".