197859661 has 6 divisors (see below), whose sum is σ = 201214986. Its totient is φ = 194508000.

The previous prime is 197859637. The next prime is 197859709. The reversal of 197859661 is 166958791.

It can be written as a sum of positive squares in 3 ways, for example, as 20304036 + 177555625 = 4506^2 + 13325^2 .

It is not a de Polignac number, because 197859661 - 2⁹ = 197859149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197859599 and 197859608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197859611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108961 + ... + 110761.

It is an arithmetic number, because the mean of its divisors is an integer number (33535831).

Almost surely, 2^197859661 is an apocalyptic number.

It is an amenable number.

197859661 is a deficient number, since it is larger than the sum of its proper divisors (3355325).

197859661 is an frugal number, since it uses more digits than its factorization.

197859661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663 (or 1862 counting only the distinct ones).

The product of its digits is 816480, while the sum is 52.

The square root of 197859661 is about 14066.2596663079. The cubic root of 197859661 is about 582.7099316386.

The spelling of 197859661 in words is "one hundred ninety-seven million, eight hundred fifty-nine thousand, six hundred sixty-one".