181197 has 10 divisors (see below), whose sum is σ = 270798. Its totient is φ = 120744.

The previous prime is 181193. The next prime is 181199. The reversal of 181197 is 791181.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 9801 = 414^2 + 99^2 .

It is not a de Polignac number, because 181197 - 2² = 181193 is a prime.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 181197.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181197.

It is not an unprimeable number, because it can be changed into a prime (181193) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1038 + ... + 1199.

2¹⁸¹¹⁹⁷ is an apocalyptic number.

It is an amenable number.

181197 is a deficient number, since it is larger than the sum of its proper divisors (89601).

181197 is an equidigital number, since it uses as much as digits as its factorization.

181197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249 (or 2240 counting only the distinct ones).

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

The square root of 181197 is about 425.6724092539. The cubic root of 181197 is about 56.5870431120.

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

The spelling of 181197 in words is "one hundred eighty-one thousand, one hundred ninety-seven".