196188561 has 20 divisors (see below), whose sum is σ = 295985844. Its totient is φ = 129492000.

The previous prime is 196188539. The next prime is 196188569. The reversal of 196188561 is 165881691.

196188561 is a `hidden beast` number, since 1 + 9 + 6 + 1 + 88 + 561 = 666.

196188561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 79548561 + 116640000 = 8919^2 + 10800^2 .

It is not a de Polignac number, because 196188561 - 2¹⁴ = 196172177 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196188569) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3810 + ... + 20171.

Almost surely, 2^196188561 is an apocalyptic number.

It is an amenable number.

196188561 is a deficient number, since it is larger than the sum of its proper divisors (99797283).

196188561 is a wasteful number, since it uses less digits than its factorization.

196188561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24094 (or 24085 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 196188561 is about 14006.7327025256. The cubic root of 196188561 is about 581.0647909394.

The spelling of 196188561 in words is "one hundred ninety-six million, one hundred eighty-eight thousand, five hundred sixty-one".