195721071 has 64 divisors (see below), whose sum is σ = 342451200. Its totient is φ = 96546816.

The previous prime is 195721061. The next prime is 195721093. The reversal of 195721071 is 170127591.

It is not a de Polignac number, because 195721071 - 2¹¹ = 195719023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195721021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 502945 + ... + 503333.

It is an arithmetic number, because the mean of its divisors is an integer number (5350800).

Almost surely, 2^195721071 is an apocalyptic number.

195721071 is a deficient number, since it is larger than the sum of its proper divisors (146730129).

195721071 is a wasteful number, since it uses less digits than its factorization.

195721071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its (nonzero) digits is 4410, while the sum is 33.

The square root of 195721071 is about 13990.0347033165. The cubic root of 195721071 is about 580.6028917245.

The spelling of 195721071 in words is "one hundred ninety-five million, seven hundred twenty-one thousand, seventy-one".