247105 has 8 divisors (see below), whose sum is σ = 301032. Its totient is φ = 194688.

The previous prime is 247099. The next prime is 247141. The reversal of 247105 is 501742.

247105 = 351² + 352².

It can be written as a sum of positive squares in 4 ways, for example, as 104976 + 142129 = 324^2 + 377^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 2-Lehmer number, since φ(247105) divides (247105-1)².

It is a cyclic number.

It is not a de Polignac number, because 247105 - 2⁵ = 247073 is a prime.

It is a super-2 number, since 2×247105² = 122121762050, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27 + ... + 703.

It is an arithmetic number, because the mean of its divisors is an integer number (37629).

2²⁴⁷¹⁰⁵ is an apocalyptic number.

247105 is the 352-nd centered square number.

It is an amenable number.

247105 is a deficient number, since it is larger than the sum of its proper divisors (53927).

247105 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 8 representation: 247105 = (742501)₈.

247105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 247105 is about 497.0965700948. The cubic root of 247105 is about 62.7519430307.

Adding to 247105 its reverse (501742), we get a palindrome (748847).

The spelling of 247105 in words is "two hundred forty-seven thousand, one hundred five".