3961806197 has 2 divisors, whose sum is σ = 3961806198. Its totient is φ = 3961806196.

The previous prime is 3961806151. The next prime is 3961806221. The reversal of 3961806197 is 7916081693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3721122001 + 240684196 = 61001^2 + 15514^2 .

It is a cyclic number.

It is not a de Polignac number, because 3961806197 - 2⁶ = 3961806133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3961806137) 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, 1980903098 + 1980903099.

It is an arithmetic number, because the mean of its divisors is an integer number (1980903099).

Almost surely, 2^3961806197 is an apocalyptic number.

It is an amenable number.

3961806197 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961806197 is an equidigital number, since it uses as much as digits as its factorization.

3961806197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 3961806197 is about 62942.8804313879. The cubic root of 3961806197 is about 1582.3324783092.

The spelling of 3961806197 in words is "three billion, nine hundred sixty-one million, eight hundred six thousand, one hundred ninety-seven".