121717 has 4 divisors (see below), whose sum is σ = 123840. Its totient is φ = 119596.
The previous prime is 121711. The next prime is 121721. The reversal of 121717 is 717121.
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: 717121 = 97 ⋅7393.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-121717 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 121694 and 121703.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (121711) 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, 973 + ... + 1090.
It is an arithmetic number, because the mean of its divisors is an integer number (30960).
2121717 is an apocalyptic number.
It is an amenable number.
121717 is a deficient number, since it is larger than the sum of its proper divisors (2123).
121717 is an equidigital number, since it uses as much as digits as its factorization.
121717 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2122.
The product of its digits is 98, while the sum is 19.
The square root of 121717 is about 348.8796354045. The cubic root of 121717 is about 49.5583775427.
Adding to 121717 its reverse (717121), we get a palindrome (838838).
It can be divided in two parts, 121 and 717, that added together give a palindrome (838).
The spelling of 121717 in words is "one hundred twenty-one thousand, seven hundred seventeen", and thus it is an iban number.
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