197911 has 8 divisors (see below), whose sum is σ = 231200. Its totient is φ = 169344.

The previous prime is 197909. The next prime is 197921. The reversal of 197911 is 119791.

It is not a de Polignac number, because 197911 - 2¹ = 197909 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 197911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197921) 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, 55 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (28900).

2¹⁹⁷⁹¹¹ is an apocalyptic number.

197911 is a deficient number, since it is larger than the sum of its proper divisors (33289).

197911 is an frugal number, since it uses more digits than its factorization.

197911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 584 counting only the distinct ones).

The product of its digits is 567, while the sum is 28.

The square root of 197911 is about 444.8718916722. The cubic root of 197911 is about 58.2760326209.

The spelling of 197911 in words is "one hundred ninety-seven thousand, nine hundred eleven".