195891385 has 4 divisors (see below), whose sum is σ = 235069668. Its totient is φ = 156713104.

The previous prime is 195891329. The next prime is 195891389. The reversal of 195891385 is 583198591.

195891385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583198591 = 53 ⋅11003747.

It can be written as a sum of positive squares in 2 ways, for example, as 30074256 + 165817129 = 5484^2 + 12877^2 .

It is a cyclic number.

It is not a de Polignac number, because 195891385 - 2¹⁹ = 195367097 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195891389) 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, 19589134 + ... + 19589143.

It is an arithmetic number, because the mean of its divisors is an integer number (58767417).

Almost surely, 2^195891385 is an apocalyptic number.

It is an amenable number.

195891385 is a deficient number, since it is larger than the sum of its proper divisors (39178283).

195891385 is an equidigital number, since it uses as much as digits as its factorization.

195891385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39178282.

The product of its digits is 388800, while the sum is 49.

The square root of 195891385 is about 13996.1203552985. The cubic root of 195891385 is about 580.7712539955.

The spelling of 195891385 in words is "one hundred ninety-five million, eight hundred ninety-one thousand, three hundred eighty-five".