195897489 has 4 divisors (see below), whose sum is σ = 261196656. Its totient is φ = 130598324.

The previous prime is 195897473. The next prime is 195897491. The reversal of 195897489 is 984798591.

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 195897489 - 2⁴ = 195897473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (195897439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32649579 + ... + 32649584.

It is an arithmetic number, because the mean of its divisors is an integer number (65299164).

Almost surely, 2^195897489 is an apocalyptic number.

It is an amenable number.

195897489 is a deficient number, since it is larger than the sum of its proper divisors (65299167).

195897489 is an equidigital number, since it uses as much as digits as its factorization.

195897489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65299166.

The product of its digits is 6531840, while the sum is 60.

The square root of 195897489 is about 13996.3384140281. The cubic root of 195897489 is about 580.7772862345. Note that the first 3 decimals are identical.

The spelling of 195897489 in words is "one hundred ninety-five million, eight hundred ninety-seven thousand, four hundred eighty-nine".