195253309 has 2 divisors, whose sum is σ = 195253310. Its totient is φ = 195253308.

The previous prime is 195253307. The next prime is 195253321. The reversal of 195253309 is 903352591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178623225 + 16630084 = 13365^2 + 4078^2 .

It is a cyclic number.

It is not a de Polignac number, because 195253309 - 2¹ = 195253307 is a prime.

Together with 195253307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195253307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97626654 + 97626655.

It is an arithmetic number, because the mean of its divisors is an integer number (97626655).

Almost surely, 2^195253309 is an apocalyptic number.

It is an amenable number.

195253309 is a deficient number, since it is larger than the sum of its proper divisors (1).

195253309 is an equidigital number, since it uses as much as digits as its factorization.

195253309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 37.

The square root of 195253309 is about 13973.3070173098. The cubic root of 195253309 is about 580.1399870190.

The spelling of 195253309 in words is "one hundred ninety-five million, two hundred fifty-three thousand, three hundred nine".