196055861 has 2 divisors, whose sum is σ = 196055862. Its totient is φ = 196055860.

The previous prime is 196055857. The next prime is 196055897. The reversal of 196055861 is 168550691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186868900 + 9186961 = 13670^2 + 3031^2 .

It is a cyclic number.

It is not a de Polignac number, because 196055861 - 2² = 196055857 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196055261) by changing a digit.

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 as a sum of consecutive naturals, namely, 98027930 + 98027931.

It is an arithmetic number, because the mean of its divisors is an integer number (98027931).

Almost surely, 2^196055861 is an apocalyptic number.

It is an amenable number.

196055861 is a deficient number, since it is larger than the sum of its proper divisors (1).

196055861 is an equidigital number, since it uses as much as digits as its factorization.

196055861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 196055861 is about 14001.9948935857. The cubic root of 196055861 is about 580.9337525669.

The spelling of 196055861 in words is "one hundred ninety-six million, fifty-five thousand, eight hundred sixty-one".