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11917 = 17701
BaseRepresentation
bin10111010001101
3121100101
42322031
5340132
6131101
746513
oct27215
917311
1011917
118a54
126a91
135569
1444b3
1537e7
hex2e8d

11917 has 4 divisors (see below), whose sum is σ = 12636. Its totient is φ = 11200.

The previous prime is 11909. The next prime is 11923. The reversal of 11917 is 71911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71911 = 710273.

It can be written as a sum of positive squares in 2 ways, for example, as 9801 + 2116 = 99^2 + 46^2 .

It is a cyclic number.

It is not a de Polignac number, because 11917 - 23 = 11909 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 11894 and 11903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11927) 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, 334 + ... + 367.

It is an arithmetic number, because the mean of its divisors is an integer number (3159).

211917 is an apocalyptic number.

11917 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11917 is a deficient number, since it is larger than the sum of its proper divisors (719).

11917 is an equidigital number, since it uses as much as digits as its factorization.

11917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718.

The product of its digits is 63, while the sum is 19.

The square root of 11917 is about 109.1650127101. The cubic root of 11917 is about 22.8413786391.

It can be divided in two parts, 119 and 17, that added together give a triangular number (136 = T16).

The spelling of 11917 in words is "eleven thousand, nine hundred seventeen".

Divisors: 1 17 701 11917