248509 has 2 divisors, whose sum is σ = 248510. Its totient is φ = 248508.
The previous prime is 248483. The next prime is 248533. The reversal of 248509 is 905842.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 142884 + 105625 = 378^2 + 325^2 .
It is a cyclic number.
It is not a de Polignac number, because 248509 - 25 = 248477 is a prime.
It is a Chen prime.
It is a nialpdrome in base 12.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (248569) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124254 + 124255.
It is an arithmetic number, because the mean of its divisors is an integer number (124255).
2248509 is an apocalyptic number.
It is an amenable number.
248509 is a deficient number, since it is larger than the sum of its proper divisors (1).
248509 is an equidigital number, since it uses as much as digits as its factorization.
248509 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 2880, while the sum is 28.
The square root of 248509 is about 498.5067702650. The cubic root of 248509 is about 62.8705665447.
It can be divided in two parts, 248 and 509, that added together give a palindrome (757).
The spelling of 248509 in words is "two hundred forty-eight thousand, five hundred nine".
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