195722389 has 2 divisors, whose sum is σ = 195722390. Its totient is φ = 195722388.

The previous prime is 195722381. The next prime is 195722399. The reversal of 195722389 is 983227591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111999889 + 83722500 = 10583^2 + 9150^2 .

It is a cyclic number.

It is not a de Polignac number, because 195722389 - 2³ = 195722381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195722381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97861194 + 97861195.

It is an arithmetic number, because the mean of its divisors is an integer number (97861195).

Almost surely, 2^195722389 is an apocalyptic number.

It is an amenable number.

195722389 is a deficient number, since it is larger than the sum of its proper divisors (1).

195722389 is an equidigital number, since it uses as much as digits as its factorization.

195722389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 195722389 is about 13990.0818081954. The cubic root of 195722389 is about 580.6041949957.

The spelling of 195722389 in words is "one hundred ninety-five million, seven hundred twenty-two thousand, three hundred eighty-nine".