195142289 has 2 divisors, whose sum is σ = 195142290. Its totient is φ = 195142288.

The previous prime is 195142267. The next prime is 195142301. The reversal of 195142289 is 982241591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110355025 + 84787264 = 10505^2 + 9208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195142289 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (195142229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97571144 + 97571145.

It is an arithmetic number, because the mean of its divisors is an integer number (97571145).

Almost surely, 2^195142289 is an apocalyptic number.

It is an amenable number.

195142289 is a deficient number, since it is larger than the sum of its proper divisors (1).

195142289 is an equidigital number, since it uses as much as digits as its factorization.

195142289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 195142289 is about 13969.3338781776. Note that the first 3 decimals coincide. The cubic root of 195142289 is about 580.0300113286.

The spelling of 195142289 in words is "one hundred ninety-five million, one hundred forty-two thousand, two hundred eighty-nine".