195551 has 4 divisors (see below), whose sum is σ = 207072. Its totient is φ = 184032.

The previous prime is 195541. The next prime is 195581. The reversal of 195551 is 155591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 195551 - 2¹⁰ = 194527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 195551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5735 + ... + 5768.

It is an arithmetic number, because the mean of its divisors is an integer number (51768).

2¹⁹⁵⁵⁵¹ is an apocalyptic number.

195551 is a deficient number, since it is larger than the sum of its proper divisors (11521).

195551 is a wasteful number, since it uses less digits than its factorization.

195551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11520.

The product of its digits is 1125, while the sum is 26.

The square root of 195551 is about 442.2114878653. The cubic root of 195551 is about 58.0434672178.

The spelling of 195551 in words is "one hundred ninety-five thousand, five hundred fifty-one".