117721 has 2 divisors, whose sum is σ = 117722. Its totient is φ = 117720.
The previous prime is 117709. The next prime is 117727. The reversal of 117721 is 127711.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 99225 + 18496 = 315^2 + 136^2 .
It is an emirp because it is prime and its reverse (127711) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 117721 - 29 = 117209 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (117727) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58860 + 58861.
It is an arithmetic number, because the mean of its divisors is an integer number (58861).
2117721 is an apocalyptic number.
It is an amenable number.
117721 is a deficient number, since it is larger than the sum of its proper divisors (1).
117721 is an equidigital number, since it uses as much as digits as its factorization.
117721 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 98, while the sum is 19.
The square root of 117721 is about 343.1049402151. The cubic root of 117721 is about 49.0099937966.
It can be divided in two parts, 117 and 721, that added together give a palindrome (838).
The spelling of 117721 in words is "one hundred seventeen thousand, seven hundred twenty-one", and thus it is an iban number.
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