195850409 has 2 divisors, whose sum is σ = 195850410. Its totient is φ = 195850408.

The previous prime is 195850393. The next prime is 195850429. The reversal of 195850409 is 904058591.

It is a happy number.

195850409 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., 156750400 + 39100009 = 12520^2 + 6253^2 .

It is an emirp because it is prime and its reverse (904058591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195850409 - 2⁴ = 195850393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (195850429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97925204 + 97925205.

It is an arithmetic number, because the mean of its divisors is an integer number (97925205).

Almost surely, 2^195850409 is an apocalyptic number.

It is an amenable number.

195850409 is a deficient number, since it is larger than the sum of its proper divisors (1).

195850409 is an equidigital number, since it uses as much as digits as its factorization.

195850409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 195850409 is about 13994.6564445148. The cubic root of 195850409 is about 580.7307564814.

The spelling of 195850409 in words is "one hundred ninety-five million, eight hundred fifty thousand, four hundred nine".