195509273 has 4 divisors (see below), whose sum is σ = 195642240. Its totient is φ = 195376308.

The previous prime is 195509201. The next prime is 195509291. The reversal of 195509273 is 372905591.

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, and also an emirpimes, since its reverse is a distinct semiprime: 372905591 = 17 ⋅21935623.

It is a cyclic number.

It is not a de Polignac number, because 195509273 - 2¹⁰ = 195508249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 195509273.

It is not an unprimeable number, because it can be changed into a prime (195509173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64253 + ... + 67226.

It is an arithmetic number, because the mean of its divisors is an integer number (48910560).

Almost surely, 2^195509273 is an apocalyptic number.

It is an amenable number.

195509273 is a deficient number, since it is larger than the sum of its proper divisors (132967).

195509273 is a wasteful number, since it uses less digits than its factorization.

195509273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132966.

The product of its (nonzero) digits is 85050, while the sum is 41.

The square root of 195509273 is about 13982.4630519805. The cubic root of 195509273 is about 580.3933845340.

The spelling of 195509273 in words is "one hundred ninety-five million, five hundred nine thousand, two hundred seventy-three".