195820321 has 4 divisors (see below), whose sum is σ = 204334272. Its totient is φ = 187306372.

The previous prime is 195820301. The next prime is 195820337. The reversal of 195820321 is 123028591.

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 195820321 - 2¹³ = 195812129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195820301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4256941 + ... + 4256986.

It is an arithmetic number, because the mean of its divisors is an integer number (51083568).

Almost surely, 2^195820321 is an apocalyptic number.

It is an amenable number.

195820321 is a deficient number, since it is larger than the sum of its proper divisors (8513951).

195820321 is an equidigital number, since it uses as much as digits as its factorization.

195820321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513950.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 195820321 is about 13993.5814214946. The cubic root of 195820321 is about 580.7010162289.

The spelling of 195820321 in words is "one hundred ninety-five million, eight hundred twenty thousand, three hundred twenty-one".