195521 has 4 divisors (see below), whose sum is σ = 200112. Its totient is φ = 190932.

The previous prime is 195511. The next prime is 195527. The reversal of 195521 is 125591.

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 195521 - 2⁶ = 195457 is a prime.

It is a super-2 number, since 2×195521² = 76456922882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2231 + ... + 2316.

It is an arithmetic number, because the mean of its divisors is an integer number (50028).

2¹⁹⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

195521 is a deficient number, since it is larger than the sum of its proper divisors (4591).

195521 is an equidigital number, since it uses as much as digits as its factorization.

195521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4590.

The product of its digits is 450, while the sum is 23.

The square root of 195521 is about 442.1775661428. The cubic root of 195521 is about 58.0404988650.

The spelling of 195521 in words is "one hundred ninety-five thousand, five hundred twenty-one".