195391 has 8 divisors (see below), whose sum is σ = 226304. Its totient is φ = 165240.

The previous prime is 195389. The next prime is 195401. The reversal of 195391 is 193591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 195391 - 2¹ = 195389 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 586 + ... + 856.

It is an arithmetic number, because the mean of its divisors is an integer number (28288).

2¹⁹⁵³⁹¹ is an apocalyptic number.

195391 is a deficient number, since it is larger than the sum of its proper divisors (30913).

195391 is a wasteful number, since it uses less digits than its factorization.

195391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381.

The product of its digits is 1215, while the sum is 28.

The square root of 195391 is about 442.0305419312. The cubic root of 195391 is about 58.0276324931.

It can be divided in two parts, 195 and 391, that multiplied together give a triangular number (76245 = T₃₉₀).

The spelling of 195391 in words is "one hundred ninety-five thousand, three hundred ninety-one".