195247121 has 2 divisors, whose sum is σ = 195247122. Its totient is φ = 195247120.

The previous prime is 195247103. The next prime is 195247123. The reversal of 195247121 is 121742591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194323600 + 923521 = 13940^2 + 961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195247121 is a prime.

Together with 195247123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195247123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97623560 + 97623561.

It is an arithmetic number, because the mean of its divisors is an integer number (97623561).

Almost surely, 2^195247121 is an apocalyptic number.

It is an amenable number.

195247121 is a deficient number, since it is larger than the sum of its proper divisors (1).

195247121 is an equidigital number, since it uses as much as digits as its factorization.

195247121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 195247121 is about 13973.0855933827. The cubic root of 195247121 is about 580.1338583236.

The spelling of 195247121 in words is "one hundred ninety-five million, two hundred forty-seven thousand, one hundred twenty-one".