195128247 has 8 divisors (see below), whose sum is σ = 262697344. Its totient is φ = 128822328.

The previous prime is 195128243. The next prime is 195128249. The reversal of 195128247 is 742821591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 195128247 - 2² = 195128243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195128243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315433 + ... + 316050.

It is an arithmetic number, because the mean of its divisors is an integer number (32837168).

Almost surely, 2^195128247 is an apocalyptic number.

195128247 is a deficient number, since it is larger than the sum of its proper divisors (67569097).

195128247 is a wasteful number, since it uses less digits than its factorization.

195128247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631589.

The product of its digits is 40320, while the sum is 39.

The square root of 195128247 is about 13968.8312682200. The cubic root of 195128247 is about 580.0160984434.

The spelling of 195128247 in words is "one hundred ninety-five million, one hundred twenty-eight thousand, two hundred forty-seven".