197081 has 4 divisors (see below), whose sum is σ = 208692. Its totient is φ = 185472.

The previous prime is 197077. The next prime is 197083. The reversal of 197081 is 180791.

197081 = 59² + 60² + ... + 92².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180791 = 13 ⋅13907.

It can be written as a sum of positive squares in 2 ways, for example, as 173056 + 24025 = 416^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 197081 - 2² = 197077 is a prime.

It is a super-2 number, since 2×197081² = 77681841122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 197081.

It is not an unprimeable number, because it can be changed into a prime (197083) 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, 5780 + ... + 5813.

It is an arithmetic number, because the mean of its divisors is an integer number (52173).

2¹⁹⁷⁰⁸¹ is an apocalyptic number.

It is an amenable number.

197081 is a deficient number, since it is larger than the sum of its proper divisors (11611).

197081 is a wasteful number, since it uses less digits than its factorization.

197081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11610.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 197081 is about 443.9380587424. The cubic root of 197081 is about 58.1944523788.

Subtracting from 197081 its reverse (180791), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 197081 in words is "one hundred ninety-seven thousand, eighty-one".