195147009521 has 4 divisors (see below), whose sum is σ = 199685312112. Its totient is φ = 190608706932.

The previous prime is 195147009517. The next prime is 195147009553. The reversal of 195147009521 is 125900741591.

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.

It is a cyclic number.

It is not a de Polignac number, because 195147009521 - 2² = 195147009517 is a prime.

It is a super-3 number, since 3×195147009521³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195147029521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2269151231 + ... + 2269151316.

It is an arithmetic number, because the mean of its divisors is an integer number (49921328028).

Almost surely, 2^195147009521 is an apocalyptic number.

It is an amenable number.

195147009521 is a deficient number, since it is larger than the sum of its proper divisors (4538302591).

195147009521 is an equidigital number, since it uses as much as digits as its factorization.

195147009521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4538302590.

The product of its (nonzero) digits is 113400, while the sum is 44.

The spelling of 195147009521 in words is "one hundred ninety-five billion, one hundred forty-seven million, nine thousand, five hundred twenty-one".