197791 has 4 divisors (see below), whose sum is σ = 215784. Its totient is φ = 179800.

The previous prime is 197779. The next prime is 197803.

It is a happy number.

197791 is nontrivially palindromic in base 10.

197791 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.

It is an interprime number because it is at equal distance from previous prime (197779) and next prime (197803).

It is a cyclic number.

It is not a de Polignac number, because 197791 - 2⁵ = 197759 is a prime.

It is a Duffinian number.

197791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197711) 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, 8980 + ... + 9001.

It is an arithmetic number, because the mean of its divisors is an integer number (53946).

2¹⁹⁷⁷⁹¹ is an apocalyptic number.

197791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197791 is a deficient number, since it is larger than the sum of its proper divisors (17993).

197791 is a wasteful number, since it uses less digits than its factorization.

197791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17992.

The product of its digits is 3969, while the sum is 34.

The square root of 197791 is about 444.7370009343. The cubic root of 197791 is about 58.2642520095.

The spelling of 197791 in words is "one hundred ninety-seven thousand, seven hundred ninety-one".