195139943 has 2 divisors, whose sum is σ = 195139944. Its totient is φ = 195139942.

The previous prime is 195139921. The next prime is 195139999. The reversal of 195139943 is 349931591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195139943 - 2²⁰ = 194091367 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 195139894 and 195139903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195139913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97569971 + 97569972.

It is an arithmetic number, because the mean of its divisors is an integer number (97569972).

Almost surely, 2^195139943 is an apocalyptic number.

195139943 is a deficient number, since it is larger than the sum of its proper divisors (1).

195139943 is an equidigital number, since it uses as much as digits as its factorization.

195139943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 44.

The square root of 195139943 is about 13969.2499082807. The cubic root of 195139943 is about 580.0276869462.

The spelling of 195139943 in words is "one hundred ninety-five million, one hundred thirty-nine thousand, nine hundred forty-three".