Search a number
-
+
195981 = 365327
BaseRepresentation
bin101111110110001101
3100221211120
4233312031
522232411
64111153
71444242
oct576615
9327746
10195981
11124275
12954b9
136b286
14515c9
153d106
hex2fd8d

195981 has 4 divisors (see below), whose sum is σ = 261312. Its totient is φ = 130652.

The previous prime is 195977. The next prime is 195991. The reversal of 195981 is 189591.

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: 189591 = 363197.

It is a cyclic number.

It is not a de Polignac number, because 195981 - 22 = 195977 is a prime.

It is a super-2 number, since 2×1959812 = 76817104722, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 195981.

It is not an unprimeable number, because it can be changed into a prime (195931) 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, 32661 + ... + 32666.

It is an arithmetic number, because the mean of its divisors is an integer number (65328).

2195981 is an apocalyptic number.

It is an amenable number.

195981 is a deficient number, since it is larger than the sum of its proper divisors (65331).

195981 is an equidigital number, since it uses as much as digits as its factorization.

195981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65330.

The product of its digits is 3240, while the sum is 33.

The square root of 195981 is about 442.6974135908. The cubic root of 195981 is about 58.0859802864.

It can be divided in two parts, 195 and 981, that added together give a triangular number (1176 = T48).

The spelling of 195981 in words is "one hundred ninety-five thousand, nine hundred eighty-one".

Divisors: 1 3 65327 195981