Search a number
-
+
207081 = 32719173
BaseRepresentation
bin110010100011101001
3101112001200
4302203221
523111311
64234413
71521510
oct624351
9345050
10207081
11131646
129ba09
1373344
1455677
1541556
hex328e9

207081 has 24 divisors (see below), whose sum is σ = 361920. Its totient is φ = 111456.

The previous prime is 207079. The next prime is 207113. The reversal of 207081 is 180702.

207081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 207081 - 21 = 207079 is a prime.

It is a super-2 number, since 2×2070812 = 85765081122, which contains 22 as substring.

207081 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (207041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1111 + ... + 1283.

It is an arithmetic number, because the mean of its divisors is an integer number (15080).

2207081 is an apocalyptic number.

207081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

207081 is a deficient number, since it is larger than the sum of its proper divisors (154839).

207081 is a wasteful number, since it uses less digits than its factorization.

207081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 207081 is about 455.0615343006. The cubic root of 207081 is about 59.1625318365.

Adding to 207081 its reverse (180702), we get a palindrome (387783).

The spelling of 207081 in words is "two hundred seven thousand, eighty-one".

Divisors: 1 3 7 9 19 21 57 63 133 171 173 399 519 1197 1211 1557 3287 3633 9861 10899 23009 29583 69027 207081