195061561 has 2 divisors, whose sum is σ = 195061562. Its totient is φ = 195061560.

The previous prime is 195061541. The next prime is 195061663. The reversal of 195061561 is 165160591.

195061561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160909225 + 34152336 = 12685^2 + 5844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195061561 is a prime.

It is not a weakly prime, because it can be changed into another prime (195061501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97530780 + 97530781.

It is an arithmetic number, because the mean of its divisors is an integer number (97530781).

Almost surely, 2^195061561 is an apocalyptic number.

It is an amenable number.

195061561 is a deficient number, since it is larger than the sum of its proper divisors (1).

195061561 is an equidigital number, since it uses as much as digits as its factorization.

195061561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 195061561 is about 13966.4441072164. Note that the first 3 decimals coincide. The cubic root of 195061561 is about 579.9500165012.

The spelling of 195061561 in words is "one hundred ninety-five million, sixty-one thousand, five hundred sixty-one".