4195691561 has 2 divisors, whose sum is σ = 4195691562. Its totient is φ = 4195691560.

The previous prime is 4195691531. The next prime is 4195691593. The reversal of 4195691561 is 1651965914.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3085135936 + 1110555625 = 55544^2 + 33325^2 .

It is a cyclic number.

It is not a de Polignac number, because 4195691561 - 2¹⁴ = 4195675177 is a prime.

It is not a weakly prime, because it can be changed into another prime (4195691531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2097845780 + 2097845781.

It is an arithmetic number, because the mean of its divisors is an integer number (2097845781).

Almost surely, 2^4195691561 is an apocalyptic number.

It is an amenable number.

4195691561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4195691561 is an equidigital number, since it uses as much as digits as its factorization.

4195691561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 47.

The square root of 4195691561 is about 64774.1581265245. The cubic root of 4195691561 is about 1612.8767621196.

The spelling of 4195691561 in words is "four billion, one hundred ninety-five million, six hundred ninety-one thousand, five hundred sixty-one".