195538521 has 16 divisors (see below), whose sum is σ = 262828800. Its totient is φ = 129308928.

The previous prime is 195538513. The next prime is 195538537. The reversal of 195538521 is 125835591.

It is not a de Polignac number, because 195538521 - 2³ = 195538513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195538521.

It is not an unprimeable number, because it can be changed into a prime (195531521) 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 15 ways as a sum of consecutive naturals, for example, 271600 + ... + 272318.

It is an arithmetic number, because the mean of its divisors is an integer number (16426800).

Almost surely, 2^195538521 is an apocalyptic number.

It is an amenable number.

195538521 is a deficient number, since it is larger than the sum of its proper divisors (67290279).

195538521 is a wasteful number, since it uses less digits than its factorization.

195538521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328.

The product of its digits is 54000, while the sum is 39.

The square root of 195538521 is about 13983.5088944084. The cubic root of 195538521 is about 580.4223251890.

The spelling of 195538521 in words is "one hundred ninety-five million, five hundred thirty-eight thousand, five hundred twenty-one".