247165 has 4 divisors (see below), whose sum is σ = 296604. Its totient is φ = 197728.

The previous prime is 247141. The next prime is 247183. The reversal of 247165 is 561742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561742 = 2 ⋅280871.

It can be written as a sum of positive squares in 2 ways, for example, as 127449 + 119716 = 357^2 + 346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247165 is a prime.

It is a super-2 number, since 2×247165² = 122181074450, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24712 + ... + 24721.

It is an arithmetic number, because the mean of its divisors is an integer number (74151).

2²⁴⁷¹⁶⁵ is an apocalyptic number.

It is an amenable number.

247165 is a deficient number, since it is larger than the sum of its proper divisors (49439).

247165 is an equidigital number, since it uses as much as digits as its factorization.

247165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49438.

The product of its digits is 1680, while the sum is 25.

The square root of 247165 is about 497.1569168784. The cubic root of 247165 is about 62.7570215896.

It can be divided in two parts, 247 and 165, that multiplied together give a triangular number (40755 = T₂₈₅).

The spelling of 247165 in words is "two hundred forty-seven thousand, one hundred sixty-five".