195428911 has 4 divisors (see below), whose sum is σ = 196599312. Its totient is φ = 194258512.

The previous prime is 195428899. The next prime is 195428917. The reversal of 195428911 is 119824591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119824591 = 41 ⋅2922551.

It is a cyclic number.

It is not a de Polignac number, because 195428911 - 2⁹ = 195428399 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 (195428917) 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, 584950 + ... + 585283.

It is an arithmetic number, because the mean of its divisors is an integer number (49149828).

Almost surely, 2^195428911 is an apocalyptic number.

195428911 is a deficient number, since it is larger than the sum of its proper divisors (1170401).

195428911 is a wasteful number, since it uses less digits than its factorization.

195428911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170400.

The product of its digits is 25920, while the sum is 40.

The square root of 195428911 is about 13979.5890855204. The cubic root of 195428911 is about 580.3138521340.

The spelling of 195428911 in words is "one hundred ninety-five million, four hundred twenty-eight thousand, nine hundred eleven".