195016121 has 2 divisors, whose sum is σ = 195016122. Its totient is φ = 195016120.

The previous prime is 195016111. The next prime is 195016127. The reversal of 195016121 is 121610591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192210496 + 2805625 = 13864^2 + 1675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195016121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195016127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97508060 + 97508061.

It is an arithmetic number, because the mean of its divisors is an integer number (97508061).

Almost surely, 2^195016121 is an apocalyptic number.

It is an amenable number.

195016121 is a deficient number, since it is larger than the sum of its proper divisors (1).

195016121 is an equidigital number, since it uses as much as digits as its factorization.

195016121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 26.

The square root of 195016121 is about 13964.8172562336. The cubic root of 195016121 is about 579.9049794794.

The spelling of 195016121 in words is "one hundred ninety-five million, sixteen thousand, one hundred twenty-one".