197971685 has 8 divisors (see below), whose sum is σ = 238940280. Its totient is φ = 157461184.

The previous prime is 197971663. The next prime is 197971717. The reversal of 197971685 is 586179791.

It can be written as a sum of positive squares in 4 ways, for example, as 34975396 + 162996289 = 5914^2 + 12767^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197971685 - 2²⁰ = 196923109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113570 + ... + 115299.

It is an arithmetic number, because the mean of its divisors is an integer number (29867535).

Almost surely, 2^197971685 is an apocalyptic number.

It is an amenable number.

197971685 is a deficient number, since it is larger than the sum of its proper divisors (40968595).

197971685 is a wasteful number, since it uses less digits than its factorization.

197971685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229047.

The product of its digits is 952560, while the sum is 53.

The square root of 197971685 is about 14070.2411137834. The cubic root of 197971685 is about 582.8198836139.

The spelling of 197971685 in words is "one hundred ninety-seven million, nine hundred seventy-one thousand, six hundred eighty-five".