195193689 has 4 divisors (see below), whose sum is σ = 260258256. Its totient is φ = 130129124.

The previous prime is 195193681. The next prime is 195193729. The reversal of 195193689 is 986391591.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 195193689 - 2³ = 195193681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195193681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32532279 + ... + 32532284.

It is an arithmetic number, because the mean of its divisors is an integer number (65064564).

Almost surely, 2^195193689 is an apocalyptic number.

It is an amenable number.

195193689 is a deficient number, since it is larger than the sum of its proper divisors (65064567).

195193689 is an equidigital number, since it uses as much as digits as its factorization.

195193689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65064566.

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

The square root of 195193689 is about 13971.1735011773. The cubic root of 195193689 is about 580.0809330184.

The spelling of 195193689 in words is "one hundred ninety-five million, one hundred ninety-three thousand, six hundred eighty-nine".