195339889 has 2 divisors, whose sum is σ = 195339890. Its totient is φ = 195339888.

The previous prime is 195339887. The next prime is 195339913. The reversal of 195339889 is 988933591.

195339889 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., 133056225 + 62283664 = 11535^2 + 7892^2 .

It is a cyclic number.

It is not a de Polignac number, because 195339889 - 2¹ = 195339887 is a prime.

Together with 195339887, 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 (195339887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97669944 + 97669945.

It is an arithmetic number, because the mean of its divisors is an integer number (97669945).

Almost surely, 2^195339889 is an apocalyptic number.

It is an amenable number.

195339889 is a deficient number, since it is larger than the sum of its proper divisors (1).

195339889 is an equidigital number, since it uses as much as digits as its factorization.

195339889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 55.

The square root of 195339889 is about 13976.4047236763. The cubic root of 195339889 is about 580.2257236756.

It can be divided in two parts, 195339 and 889, that multiplied together give a palindrome (173656371).

The spelling of 195339889 in words is "one hundred ninety-five million, three hundred thirty-nine thousand, eight hundred eighty-nine".