195007993 has 2 divisors, whose sum is σ = 195007994. Its totient is φ = 195007992.

The previous prime is 195007957. The next prime is 195007997. The reversal of 195007993 is 399700591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177768889 + 17239104 = 13333^2 + 4152^2 .

It is a cyclic number.

It is not a de Polignac number, because 195007993 - 2⁹ = 195007481 is a prime.

It is not a weakly prime, because it can be changed into another prime (195007997) 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, 97503996 + 97503997.

It is an arithmetic number, because the mean of its divisors is an integer number (97503997).

Almost surely, 2^195007993 is an apocalyptic number.

It is an amenable number.

195007993 is a deficient number, since it is larger than the sum of its proper divisors (1).

195007993 is an equidigital number, since it uses as much as digits as its factorization.

195007993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 195007993 is about 13964.5262361456. The cubic root of 195007993 is about 579.8969228238.

The spelling of 195007993 in words is "one hundred ninety-five million, seven thousand, nine hundred ninety-three".