197761 has 4 divisors (see below), whose sum is σ = 209412. Its totient is φ = 186112.

The previous prime is 197759. The next prime is 197767. The reversal of 197761 is 167791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167791 = 13 ⋅12907.

It can be written as a sum of positive squares in 2 ways, for example, as 144400 + 53361 = 380^2 + 231^2 .

It is a cyclic number.

It is not a de Polignac number, because 197761 - 2¹ = 197759 is a prime.

It is a Duffinian number.

197761 is a lucky number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (197767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5800 + ... + 5833.

It is an arithmetic number, because the mean of its divisors is an integer number (52353).

2¹⁹⁷⁷⁶¹ is an apocalyptic number.

It is an amenable number.

197761 is a deficient number, since it is larger than the sum of its proper divisors (11651).

197761 is a wasteful number, since it uses less digits than its factorization.

197761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11650.

The product of its digits is 2646, while the sum is 31.

The square root of 197761 is about 444.7032718566. The cubic root of 197761 is about 58.2613061122.

The spelling of 197761 in words is "one hundred ninety-seven thousand, seven hundred sixty-one".