247481 has 4 divisors (see below), whose sum is σ = 266532. Its totient is φ = 228432.

The previous prime is 247463. The next prime is 247501. The reversal of 247481 is 184742.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13225 + 234256 = 115^2 + 484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247481 is a prime.

It is a super-2 number, since 2×247481² = 122493690722, which contains 22 as substring.

It is a Duffinian number.

247481 is a modest number, since divided by 481 gives 247 as remainder.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 247481.

It is not an unprimeable number, because it can be changed into a prime (247421) 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, 9506 + ... + 9531.

It is an arithmetic number, because the mean of its divisors is an integer number (66633).

2²⁴⁷⁴⁸¹ is an apocalyptic number.

It is an amenable number.

247481 is a deficient number, since it is larger than the sum of its proper divisors (19051).

247481 is a wasteful number, since it uses less digits than its factorization.

247481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19050.

The product of its digits is 1792, while the sum is 26.

The square root of 247481 is about 497.4746224683. The cubic root of 247481 is about 62.7837551123.

The spelling of 247481 in words is "two hundred forty-seven thousand, four hundred eighty-one".