197385606961 has 3 divisors (see below), whose sum is σ = 197386051243. Its totient is φ = 197385162680.

The previous prime is 197385606949. The next prime is 197385606967. The reversal of 197385606961 is 169606583791.

The square root of 197385606961 is 444281.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 169606583791 = 22157 ⋅7654763.

It can be written as a sum of positive squares in only one way, i.e., 180014366961 + 17371240000 = 424281^2 + 131800^2 .

It is not a de Polignac number, because 197385606961 - 2⁹ = 197385606449 is a prime.

It is a super-2 number, since 2×197385606961² (a number of 23 digits) contains 22 as substring.

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 197385606961.

It is not an unprimeable number, because it can be changed into a prime (197385606967) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 222141 + ... + 666421.

Almost surely, 2^197385606961 is an apocalyptic number.

197385606961 is the 444281-st square number.

197385606961 is the 222141-st centered octagonal number.

It is an amenable number.

197385606961 is a deficient number, since it is larger than the sum of its proper divisors (444282).

197385606961 is an frugal number, since it uses more digits than its factorization.

197385606961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888562 (or 444281 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 61.

The spelling of 197385606961 in words is "one hundred ninety-seven billion, three hundred eighty-five million, six hundred six thousand, nine hundred sixty-one".