195979321 has 2 divisors, whose sum is σ = 195979322. Its totient is φ = 195979320.

The previous prime is 195979307. The next prime is 195979339. The reversal of 195979321 is 123979591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152893225 + 43086096 = 12365^2 + 6564^2 .

It is a cyclic number.

It is not a de Polignac number, because 195979321 - 2⁷ = 195979193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195979921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97989660 + 97989661.

It is an arithmetic number, because the mean of its divisors is an integer number (97989661).

Almost surely, 2^195979321 is an apocalyptic number.

It is an amenable number.

195979321 is a deficient number, since it is larger than the sum of its proper divisors (1).

195979321 is an equidigital number, since it uses as much as digits as its factorization.

195979321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 46.

The square root of 195979321 is about 13999.2614448049. The cubic root of 195979321 is about 580.8581440868.

The spelling of 195979321 in words is "one hundred ninety-five million, nine hundred seventy-nine thousand, three hundred twenty-one".