195821063 has 4 divisors (see below), whose sum is σ = 195957840. Its totient is φ = 195684288.

The previous prime is 195821051. The next prime is 195821089. The reversal of 195821063 is 360128591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 360128591 = 1013 ⋅355507.

It is a cyclic number.

It is not a de Polignac number, because 195821063 - 2¹⁰ = 195820039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195821033) 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, 66218 + ... + 69111.

It is an arithmetic number, because the mean of its divisors is an integer number (48989460).

Almost surely, 2^195821063 is an apocalyptic number.

195821063 is a deficient number, since it is larger than the sum of its proper divisors (136777).

195821063 is a wasteful number, since it uses less digits than its factorization.

195821063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136776.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 195821063 is about 13993.6079336246. The cubic root of 195821063 is about 580.7017496897.

The spelling of 195821063 in words is "one hundred ninety-five million, eight hundred twenty-one thousand, sixty-three".