247213 has 4 divisors (see below), whose sum is σ = 248508. Its totient is φ = 245920.

The previous prime is 247201. The next prime is 247223. The reversal of 247213 is 312742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312742 = 2 ⋅156371.

It can be written as a sum of positive squares in 2 ways, for example, as 104329 + 142884 = 323^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 247213 - 2¹⁷ = 116141 is a prime.

It is a super-2 number, since 2×247213² = 122228534738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247223) 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 in 3 ways as a sum of consecutive naturals, for example, 298 + ... + 763.

It is an arithmetic number, because the mean of its divisors is an integer number (62127).

2²⁴⁷²¹³ is an apocalyptic number.

It is an amenable number.

247213 is a deficient number, since it is larger than the sum of its proper divisors (1295).

247213 is a wasteful number, since it uses less digits than its factorization.

247213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294.

The product of its digits is 336, while the sum is 19.

The square root of 247213 is about 497.2051890317. The cubic root of 247213 is about 62.7610838450.

Adding to 247213 its reverse (312742), we get a palindrome (559955).

It can be divided in two parts, 2472 and 13, that added together give a triangular number (2485 = T₇₀).

The spelling of 247213 in words is "two hundred forty-seven thousand, two hundred thirteen".