195557 has 4 divisors (see below), whose sum is σ = 196896. Its totient is φ = 194220.

The previous prime is 195541. The next prime is 195581. The reversal of 195557 is 755591.

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, and also an emirpimes, since its reverse is a distinct semiprime: 755591 = 211 ⋅3581.

It is a cyclic number.

It is not a de Polignac number, because 195557 - 2⁴ = 195541 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419 + ... + 752.

It is an arithmetic number, because the mean of its divisors is an integer number (49224).

2¹⁹⁵⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

195557 is a deficient number, since it is larger than the sum of its proper divisors (1339).

195557 is a wasteful number, since it uses less digits than its factorization.

195557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338.

The product of its digits is 7875, while the sum is 32.

The square root of 195557 is about 442.2182718975. The cubic root of 195557 is about 58.0440608520.

The spelling of 195557 in words is "one hundred ninety-five thousand, five hundred fifty-seven".