195391689 has 8 divisors (see below), whose sum is σ = 260636352. Its totient is φ = 130204080.

The previous prime is 195391639. The next prime is 195391717. The reversal of 195391689 is 986193591.

It is a happy number.

195391689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 195391689 - 2⁹ = 195391177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (195391619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5502 + ... + 20519.

It is an arithmetic number, because the mean of its divisors is an integer number (32579544).

Almost surely, 2^195391689 is an apocalyptic number.

It is an amenable number.

195391689 is a deficient number, since it is larger than the sum of its proper divisors (65244663).

195391689 is a wasteful number, since it uses less digits than its factorization.

195391689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28527.

The product of its digits is 524880, while the sum is 51.

The square root of 195391689 is about 13978.2577240513. The cubic root of 195391689 is about 580.2770069991.

The spelling of 195391689 in words is "one hundred ninety-five million, three hundred ninety-one thousand, six hundred eighty-nine".