197181 has 16 divisors (see below), whose sum is σ = 299200. Its totient is φ = 128304.

The previous prime is 197161. The next prime is 197203. The reversal of 197181 is 181791.

It is not a de Polignac number, because 197181 - 2⁶ = 197117 is a prime.

It is a super-2 number, since 2×197181² = 77760693522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1755 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (18700).

2¹⁹⁷¹⁸¹ is an apocalyptic number.

It is an amenable number.

197181 is a deficient number, since it is larger than the sum of its proper divisors (102019).

197181 is a wasteful number, since it uses less digits than its factorization.

197181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 179 counting only the distinct ones).

The product of its digits is 504, while the sum is 27.

The square root of 197181 is about 444.0506727841. The cubic root of 197181 is about 58.2042934446.

It can be divided in two parts, 197 and 181, that added together give a triangular number (378 = T₂₇).

The spelling of 197181 in words is "one hundred ninety-seven thousand, one hundred eighty-one".