195139111 has 2 divisors, whose sum is σ = 195139112. Its totient is φ = 195139110.

The previous prime is 195139093. The next prime is 195139121. The reversal of 195139111 is 111931591.

195139111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195139111 - 2⁹ = 195138599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195139121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97569555 + 97569556.

It is an arithmetic number, because the mean of its divisors is an integer number (97569556).

Almost surely, 2^195139111 is an apocalyptic number.

195139111 is a deficient number, since it is larger than the sum of its proper divisors (1).

195139111 is an equidigital number, since it uses as much as digits as its factorization.

195139111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1215, while the sum is 31.

The square root of 195139111 is about 13969.2201285541. The cubic root of 195139111 is about 580.0268626084.

The spelling of 195139111 in words is "one hundred ninety-five million, one hundred thirty-nine thousand, one hundred eleven".